Universal Audio Apollo x8p Thunderbolt 3 Audio Interface User Manual

Thunderbolt 3 Audio Interface

Apollo x8p Hardware Manual

Manual Version 201029

www.uaudio.com

A Letter from Bill Putnam Jr.

Thank you for choosing this Apollo X Series audio interface to become a part of your
studio. We know that any new piece of gear requires an investment of time and money —
and our goal is to make your investment pay off.

Universal Audio interfaces like Apollo X exemplify a commitment to craftsmanship that
we’ve forged over the past 60 years — from our original founding in the 1950s by my
father, Bill Putnam Sr., to our current mission combining the best of both classic analog
and modern digital audio technologies.

Starting with its ultra high-quality I/O and superior A/D and D/A conversion, Apollo X
is designed to set new benchmarks in sonic performance. Breakthrough fidelity is just
the beginning, however, as Apollo X’s onboard HEXA Core processing lets you power the
full range of UAD plug-ins, including classic mic preamps, EQs, dynamics processors,
reverbs, guitar amps, and much more. With more than 100 acclaimed UAD plug-ins at
your fingertips, the sonic choices are limitless.

At UA, we are dedicated to the idea that technology should serve the creative process,
inspiring our customers to go further. These are the ideals my father embodied with his
classic designs, and we like to think this spirit lives on today in products like Apollo X.

Please feel free to reach out to us via our website www.uaudio.com, and via our social
media channels. We look forward to hearing from you, and thank you once again for
choosing Universal Audio.

Sincerely,

Bill Putnam Jr.

Apollo x8p Hardware Manual Welcome 2

Table Of Contents

Tip: Click any section or page number

to jump directly to that page.

A Letter from Bill Putnam Jr. ................................................................. 2

Introduction ......................................................................................... 4

Apollo x8p Thunderbolt 3 Audio Interface ............................................................ 4

Apollo x8p Features ........................................................................................... 7

Apollo x8p Documentation Overview .................................................................. 10

Additional Resources ....................................................................................... 11

Front Panel ........................................................................................ 12

Rear Panel ......................................................................................... 24

Digital I/O ....................................................................................................... 25

Analog I/O ...................................................................................................... 28

Interconnections ................................................................................. 32

Installation Notes ............................................................................................ 32

Connection Notes ............................................................................................ 32

Typical Setup .................................................................................................. 34

Apollo Expanded: Multi-Unit Thunderbolt 3 Wiring .............................................. 35

Software Setup ................................................................................... 36

Specifications .................................................................................... 37

Block Diagram .................................................................................... 41

DB25 Wiring ...................................................................................... 42

Troubleshooting .................................................................................. 43

Notices .............................................................................................. 44

Warranty ......................................................................................................... 44

Repair Service ................................................................................................. 44

Maintenance ................................................................................................... 44

Important Safety Information ............................................................................ 45

Technical Support ............................................................................... 48

Universal Audio Knowledge Base ....................................................................... 48

YouTube Support Channel ................................................................................. 48

Universal Audio Community Forums .................................................................. 48

Contact Universal Audio Support ....................................................................... 48

Apollo x8p Hardware Manual Table Of Contents3

Introduction

Apollo x8p Thunderbolt 3 Audio Interface

Elite-Class Audio Conversion with Eight Unison Mic Preamps, HEXA Core Processing,
and Surround Sound Monitoring.

Apollo x8p allows music engineers, producers, and project studios to track, overdub, and
mix with new world-beating A/D and D/A conversion, HEXA Core UAD plug-in processing,
and 7.1 surround sound monitoring — all in a sleek rackmount Thunderbolt 3 audio
interface for Mac or PC.

Built upon UA’s 60-year heritage of audio craftsmanship, this 16 x 22 interface
distinguishes itself with eight Unison™-enabled mic preamps, providing authentic
emulations of preamps from Neve, API, Manley, Helios, SSL and more, plus all-new
HEXA Core processing — yielding 50% more DSP for running UAD Powered Plug-Ins in
real time.

In addition to its elite-class audio conversion, Apollo x8p features selectable operating
level for compatibility with professional +24 dBu gear, as well as integrated monitor
controller features and a built-in talkback mic.

• Experience elite-class A/D and D/A conversion nearing the widest dynamic range
and lowest signal to noise available — at any price

• Track and mix with powerful HEXA Core processing, featuring 6 UAD DSP chips
for running more award-winning UAD Powered Plug-Ins in real time

• Record through 8 Unison-enabled mic/line preamps — giving you fully authentic
preamp emulations from Neve, API, Manley, SSL, Helios, and more

• Easily connect to pro-level studio gear with switchable +24 / +20 dBu headroom
settings

• Work in surround formats up to 7.1, complete with room calibration and fold-down

• Integrated talkback and built-in cues for easy communication and slating takes

*All trademarks are recognized as property of their respective owners. Individual UAD Powered Plug-Ins sold separately.

Apollo x8p Hardware Manual Introduction 4

Elite-Class A/D and D/A Conversion

With thousands of chart-topping songs and hundreds of Grammy-winning albums under
their belt, Apollo interfaces are no strangers to tracking stellar-sounding records. To
improve on the previous generation Apollo interface’s class-leading audio conversion, UA
engineers obsessively auditioned the latest A/D and D/A converters — ultimately pairing
elite-class 24-bit/192 kHz converters with all-new analog circuitry for an ultra-pristine
signal path.

With 129 dB dynamic range and -118 dB THD+N, Apollo x8p’s open, natural sound
quality rivals any dedicated high-end converter on the market — regardless of price —
and is the perfect starting point for applying UAD processing.

Realtime UAD HEXA Core Processing

Apollo x8p features new HEXA Core processing, with six DSP chips and 50% more UAD
plug-in processing power than previous Apollos. This lets you run more UAD plug-ins,
whether you’re tracking in real time with channel strips from Neve, Manley, or API, or
running high UAD plug-in counts when mixing in your DAW.

From the tube warmth of Pultec EQs on guitars to the musical tube limiting of the LA-2A
on vocals, or the pump of a genuine 1176 or Fairchild 670 tube compressor on drums,
your recordings will take a giant leap forward with a rich, three-dimensional analog sound
that UAD plug-ins provide.

Unison™ Technology: The Genuine Sound of Neve, API, & Manley Preamps

Perfect for musicians, engineers, producers, and sound designers, Apollo x8p features
eight Unison-enabled mic preamps, letting you track through exacting mic preamp
emulations from Neve, API, Manley, SSL, Helios, and Universal Audio.* A Universal
Audio exclusive, Unison technology nails the tone of these sought-after tube and solid
state mic pres — including their input impedance, gain stage “sweet spots,” and the
component-level circuit behaviors of the original hardware.

The secret to Unison is its hardware-software integration between Apollo’s mic preamps
and its onboard Realtime UAD processing.

A Full Suite of Classic Analog Processing Onboard

Of course, a hallmark feature of Apollo is its Realtime UAD Processing, letting you run
the full library of UAD plug-ins with near-zero latency. Apollo x8p includes the Realtime
Analog Classics Plus plug-in bundle, so you can record and mix with the world’s only
authentic Teletronix LA-2A, 1176LN, and Fairchild compressors, the Unison-enabled UA
610-B Tube Preamp & EQ, and guitar and bass amps from Marshall and Ampeg.

*All trademarks are recognized as property of their respective owners. Individual UAD Powered Plug-Ins sold separately.

Apollo x8p Hardware Manual Introduction 5

Access the World of UAD Powered Plug-Ins

Going beyond the included Realtime Analog Classics Plus plug-ins, Apollo x8p lets you
tap into the full UAD Powered Plug-In library of name-brand vintage EQs, compressors,
reverbs, tape machines, channel strips, and more — at near-zero latency, regardless of
your audio software’s buffer size and without taxing your computer’s CPU.

With exclusive emulations from SSL, Neve, Studer, Manley, API, Ampex, Lexicon,
Fender, Helios, and more,* it’s like having a studio full of iconic analog gear, in a single
rack space. And unlike competing interfaces, these award-winning DSP-powered plug-ins
are also available in your DAW for mixing.

Surround Sound Monitoring and +24 dBu Operation

With comprehensive surround monitoring support for formats up to 7.1, Apollo x8p
is a boon for engineers and producers working on audio and music for video games,
television, and the web. In addition, Apollo x8p offers selectable +24 dBu operation for
out-of-the-box compatibility with professional mixing consoles and other high-end pro
audio equipment.

Build a Networked Studio System Over Thunderbolt

Apollo x8p offers 16 x 22 simultaneous inputs/outputs (8 x 14 analog I/O) and two
built-in Thunderbolt 3 ports, which are backwards-compatible with Thunderbolt 1 and 2
Macs via adapter (sold separately). This allows users of any Thunderbolt-equipped Apollo
Twin or Apollo rackmount audio interfaces to easily combine up to four Apollos and six
total UAD-2 devices — adding fast, high-bandwidth I/O and DSP as your studio grows.

*All trademarks are recognized as property of their respective owners. Individual UAD Powered Plug-Ins sold separately.

Apollo x8p Hardware Manual Introduction 6

Apollo x8p Features

Key Features:

• 16 x 22 Thunderbolt 3 audio interface with class-leading 24-bit/192 KHz
conversion

• Realtime UAD HEXA Core Processing for tracking through UAD plug-ins at near­zero latency, regardless of audio buffer size

• 8 Unison-enabled mic preamps with realtime preamp emulations from Neve, API,
SSL, Manley, Universal Audio, and more*

• Surround monitor controller up to 7.1 format

• Includes “Realtime Analog Classics Plus” UAD plug-in bundle featuring UA 610­B Tube Preamp; Legacy Pultec EQ, LA-2A, and 1176 compressors; Marshall Plexi
Classic; Ampeg SVT-VR Classic and more

• UAD HEXA Core processing onboard for additional mixing horsepower for Pro
Tools, Logic, Cubase, Ableton, and other major DAWs

• Combine up to 4 Thunderbolt-equipped Apollos and 6 total UAD devices;
backward-compatible with Thunderbolt 1 and 2 via optional adapter

• Selectable +24 dBu operation for easy compatibility with professional mixing
consoles and tape machines

• Convenient front panel monitoring functions including Alt Speakers, Talkback mic,
and assignable Dim or Mono

• Uncompromising UA analog design, superior components, and premium build
quality

• Free, industry-leading technical support — on the phone and online — from
knowledgeable audio engineers

*All trademarks are recognized as property of their respective owners. Individual UAD Powered Plug-Ins sold separately.

Apollo x8p Hardware Manual Introduction 7

Audio Interface Features

• Sample rates up to 192 kHz at 24-bit word length

• 16 x 22 simultaneous input/output channels

• Eight channels of analog-to-digital conversion via mic, line, or high-impedance inputs

• 14 channels of digital-to-analog conversion via:

• Eight mono line outputs via DB25 connector

• Stereo monitor outputs

• Two stereo headphone outputs

• Up to 8 channels of digital I/O via optical TOSLINK (switchable):

• Up to eight channels ADAT I/O with S/MUX for high sample rates

• Two channels S/PDIF I/O with sample rate conversion

• Two Thunderbolt 3 ports facilitates daisy-chaining of other Thunderbolt devices

Microphone Preamplifiers

• Eight high-resolution, ultra-transparent, digitally-controlled analog mic preamps

• Unison™ technology for deep integration with UAD preamp, amp, and pedal
plug-ins

• Front panel and software control of all preamp parameters

• Switchable low cut filter, 48V phantom power, pad, polarity inversion, and stereo
linking

Monitoring

• Stereo monitor outputs (independent of the eight line outputs)

• Front panel control of monitor levels and muting

• Two stereo headphone outputs with independent mix buses

• Independent front panel volume controls for headphone outputs

• Front panel pre-fader metering of monitor bus levels

• S/PDIF outputs can be set to mirror the monitor outputs

• Up to two alternate stereo monitor outputs selectable via front panel or Console
software

• Assignable front panel monitor function switch for alternate speakers, dim, &
mono

UAD-2 Inside

• HEXA DSP featuring six SHARC® processors

• Realtime UAD Processing on all analog and digital inputs

• Same features and functionality as other UAD-2 devices when used with DAW

• Can be combined with other UAD-2 devices for increased mixing DSP

• Includes UAD Powered Plug-Ins “Realtime Analog Classics Plus” bundle

• Complete UAD Powered Plug-Ins library is available at the UA online store

Apollo x8p Hardware Manual Introduction 8

Software

Console application:

• Analog-style control interface for realtime monitoring and tracking

• Enables Realtime UAD Processing with UAD plug-ins

• Remote control of Apollo x8p features and functionality

• Virtual I/O for routing DAW tracks through Console

Console Recall plug-in:

• Saves Console configurations inside DAW sessions for easy recall

• Convenient access to Console’s monitor controls via DAW plug-in

• VST, RTAS, AAX 64, and Audio Units plug-in formats

UAD Meter & Control Panel application:

• Configures global UAD settings and monitors system usage

Other

• Easy firmware updates

• 1U rack-mountable form factor

• One year warranty includes parts and labor

Apollo x8p Hardware Manual Introduction 9

Apollo x8p Documentation Overview

Documentation for Apollo x8p and UAD Powered Plug-Ins are separated by areas of
functionality, as described below. The user manuals are placed on the system drive
during software installation, and they can be downloaded at www.uaudio.com.

Apollo Manual Files

Note: All manual files are in PDF format. PDF files require a free PDF reader
application such as Acrobat Reader (Mac & Windows) or Preview (Mac).

Apollo Hardware Manuals

Each Apollo model has a unique hardware manual. The Apollo hardware manuals contain
complete hardware-related details about one specific Apollo model. Included are detailed
descriptions of all hardware features, controls, connectors, and specifications.

Note: Each hardware manual contains the unique Apollo model in the file name.

Apollo Software Manual

The Apollo Software Manual is the companion guide to the Apollo hardware manuals.
It contains detailed information about how to configure and control all Apollo software
features using the Console application, Console Settings window, and Console Recall
plug-in. Refer to the Apollo Software Manual to learn how to operate the software tools
and integrate Apollo’s functionality into the DAW environment.

Note: Each Apollo connection protocol (Thunderbolt, FireWire, USB) has a unique
software manual.

UAD System Manual

The UAD System Manual is the complete operation manual for Apollo’s UAD-2
functionality and applies to the entire UAD-2 product family. It contains detailed
information about installing and configuring UAD devices, the UAD Meter & Control
Panel application, buying optional plug-ins at the UA online store, and more. It includes
everything about UAD except Apollo-specific information and individual UAD plug-in
descriptions.

UAD Plug-Ins Manual

The features and functionality of all individual UAD Powered Plug-Ins is detailed in the
UAD Plug-Ins Manual. Refer to this document to learn about the operation, controls, and
user interface of each UAD plug-in that is developed by Universal Audio.

Direct Developer Plug-In Manuals

UAD Powered Plug-Ins includes plug-in titles created by our Direct Developer partners.
Documentation for these 3rd-party plug-ins are separate files written and provided by the
plug-in developers. The file names for these plug-in manuals are the same as the plug-in
titles.

Apollo x8p Hardware Manual Introduction 10

Accessing Installed Documentation

Any of these methods can be used to access installed documentation:

• Choose “Documentation” from the Help menu within the Console application

• Click the “Product Manuals” button in the Help panel within the UAD Meter &
Control Panel application

• Manuals are also available online at help.uaudio.com

Host DAW Documentation

Each host DAW software application has its own particular methods for configuring and
using audio interfaces and plug-ins. Refer to the host DAW’s documentation for specific
instructions about using audio interface and plug-in features within the DAW.

Additional Resources

For additional resources, or if you need to contact Universal Audio for assistance, see the

Technical Support page.

Apollo x8p Hardware Manual Introduction 11

Front Panel

INPUT

MONITOR

HI-Z 2

HI-Z 1

PAD

INPUT

+48V

Ø LINK

METER

ALT

FCN

17

16 18 19 20

22

15

This section describes the features and functionality of all controls and visual elements
on the Apollo x8p front panel.

Tip: All front panel functions (except the METER switch, headphone volume
knobs, and power switch) can be controlled remotely with the included Console
software application. Changes made with the front panel controls are mirrored in
the Console application, and vice versa.

1

3 11

4 5 72

6

8

10

12

9

1

2 3 4

13

14

5

6 7 8

Apollo x8p front panel (left portion)

(1) Power Indicator (UA Logo)

The Universal Audio logo illuminates when the external power supply is properly
connected to the AC outlet and the power input on the rear of the unit, and the Power
switch (#27) is in the up position.

(2) Talkback Microphone

The built-in talkback mic is located inside of this hole. The talkback function is
configured and operated in the included Console software application.

Caution: The talkback microphone is sensitive. To avoid equipment damage, do

not insert any object into the mic hole, apply pressurized air into the mic hole, or
use a vacuum over the mic hole.

Apollo x8p Hardware Manual Front Panel 12

(3) Hi-Z Inputs 1 & 2

The Hi-Z (high impedance) JFET direct inputs are for connecting low-level passive
devices such as electric guitar and bass instruments into channels 1 & 2 for A/D
conversion. Hi-Z input gain levels are adjusted with the Preamp control for the
associated channel.

The Hi-Z inputs have a default input impedance of 1M Ohms. The input impedance may
vary when Unison plug-ins are inserted on the channel within the Console application.
For details, see the Unison chapter in the Apollo Software Manual.

Important: Connect only ¼” unbalanced TS mono phone plugs to the Hi-Z inputs.

TRS stereo plugs cannot be used.

Automatic Input Detection

Hi-Z inputs 1 & 2 use the same A/D converter channels as the corresponding Mic 1 &
2 and Line 1 & 2 inputs. When a device is plugged into a Hi-Z input, the Mic and Line
inputs for the channel are overridden, the Mic/Line switch for the channel has no effect,
and the stereo link is severed (if active).

Important: To use Mic or Line inputs 1 or 2, its corresponding Hi-Z input must be

disconnected.

(4) Preamp Gain & Channel Select Knob

This rotary encoder with integrated switch has three functions:

Rotate – Rotating the knob adjusts the preamp gain for the selected input channel.

Press – Pressing the knob selects which preamp channel (1 – 8) is adjusted by the

front panel preamp controls.

Press+Hold – When a Unison plug-in is active in the channel’s dedicated Unison
insert within the Console application, pressing and holding the knob for two seconds
enters/exits Unison Gain Stage Mode.

Each of these three functions above is explained in greater detail below.

Preamp Gain

The preamp gain of analog inputs 1 – 8 is adjusted with the rotary control. The preamp
channel to be adjusted is set with the Channel Select (press) function. The input to be
adjusted (Mic, Line, or Hi-Z) is determined by the state of the channel’s Mic/Line input
switch (#6) or Hi-Z input (if connected).

Rotating the knob clockwise increases the preamp gain for the selected channel. The
available gain range for the preamp channels is 10 dB to 65 dB for the Mic, Line, and
Hi-Z inputs.

More than one full revolution of the knob is needed to move through the available range.
This feature increases the control resolution for more precise preamp gain adjustments.

Tip: To adjust signal levels for inputs 9 – 18, use the output level controls of
devices connected to those inputs.

Apollo x8p Hardware Manual Front Panel 13

Line Input Gain Bypass

By default, line inputs 1 – 8 are routed through the channel’s preamp so that the line
input level can be adjusted with the Gain knob. However, line inputs 1 – 8 can be
individually set to completely bypass the channel’s preamp circuitry and instead be
routed directly to the channel’s A/D converter at a fixed reference level.

This feature is set with the LINE INPUT GAIN menus in the Hardware panel within the
Console Settings window. See the Apollo Software Manual for details.

Tip: This feature routes the preamp channel’s line input signal directly into the
A/D converter for the purest path when additional gain is not needed (for example,
when connecting external mic preamps to preamp channel line inputs).

When the channel’s LINE INPUT GAIN menu is set to BYPASS in Console Settings and
the input mode is set to LINE:

• The Preamp Gain Indicator ring (#5) for the channel is solid green.

• When the Preamp Gain knob (#4) is rotated, the ring flashes to indicate that no
gain adjustment is occurring.

• If a Unison plug-in is in the channel’s dedicated Unison insert in Console, the
Unison plug-in is bypassed.

Channel Select

Pressing the PREAMP knob changes the currently selected preamp channel, which
determines which input (1 – 8) is adjusted by the front panel preamp controls. A
preamp channel is selected for adjustment when its Channel Select Indicator (#13) is
illuminated.

Each time the knob is pressed, the selected preamp channel increments to the next
preamp channel. If stereo linking is active, the stereo pairs are selected.

Gain Stage Mode

Using Gain Stage Mode, up to three gain parameters within Unison UAD plug-ins can be
remotely controlled with the front panel PREAMP knob.

Gain Stage Mode is activated by pressing and holding the PREAMP knob for two seconds
when a Unison plug-in is active in the channel’s dedicated Unison insert within the
Console application. When Gain Stage Mode is active, pressing and holding the knob for
two seconds deactivates Gain Stage Mode.

Gain Stage Mode is active when the Channel Select Indicator (#13) for the currently
selected channel is flashing. In this state, pressing the PREAMP knob cycles through the
available gain parameters within the Unison plug-in so each gain stage in the plug-in can
be adjusted with the front panel PREAMP knob. The gain stage being controlled is shown
by the front panel Unison Indicators (#12).

Note: For complete details about Gain Stage Mode, see the Unison chapter within
the Apollo Software Manual.

Apollo x8p Hardware Manual Front Panel 14

(5) Preamp Gain Level & State Indicator

Preamp Gain Level Indicator

The amount of preamp gain for the currently selected channel is indicated by the
illuminated ring surrounding the PREAMP knob.

The ring indicates relative gain levels and is not calibrated to indicate any specific dB
value. However, precise numerical dB gain values for the preamps are displayed within
the Console application.

Note: If the ring is at maximum and flashes when the PREAMP knob is rotated,
the channel’s LINE input is selected and LINE INPUT GAIN is set to BYPASS.
See Line Input Gain Bypass for additional details.

Preamp State Indicator

In addition to the channel’s relative preamp gain, the ring around the knob also indicates
the current state of the preamp channel:

Unlit – The preamp gain is set to its minimum value (rotate the PREAMP knob
clockwise increase gain).

Green (variable) – The preamp is in default operating mode with variable gain.

Green (fixed at maximum) – LINE is selected for the channel (#6) and LINE INPUT

GAIN is set to BYPASS in the Hardware panel within the Console Settings window.

Orange – A UAD Unison plug-in is active in Console’s dedicated Unison insert for
the channel, and the PREAMP knob adjusts the first gain parameter in the Unison
plug-in.

Amber (Channel Select Indicator flashing) – A UAD Unison plug-in is active in
Console’s dedicated Unison insert for the channel, the channel is in Gain Stage
Mode, and the PREAMP knob adjusts the second gain parameter in the Unison
plug-in (if available).

Green (channel select indicator flashing) – A UAD Unison plug-in is active in
Console’s dedicated Unison insert for the channel, the channel is in Gain Stage
Mode, and the PREAMP knob adjusts the clean gain parameter in the Unison plug-in.

Note: See the Unison chapter within the Apollo Software Manual for complete
details about Unison operation and Gain Stage Mode.

Apollo x8p Hardware Manual Front Panel 15

(6 – 11) Preamp Options

This set of six switches control the preamp options for input channels 1 – 8. Press the
switches to toggle the setting. The current state of each preamp option is indicated by
the LED within each switch. Each switch function is detailed below.

(6) Input (Mic/Line)

This switch switches between the channel’s Mic (XLR) and Line (¼”) inputs on the rear
panel combo jacks. This switch has no effect if the channel’s Hi–Z input is connected
(the Hi-Z input must be disconnected to use the Mic/Line inputs).

Tip: Line inputs 1 – 8 can be set to bypass the preamp circuitry. See Line Input

Gain Bypass for additional details.

(7) Low Cut Filter

When enabled, the channel’s input signal passes through a low cut (high pass) filter. This
2nd-order coincident-pole filter has a cutoff frequency of 75 Hz with a slope of 12 dB
per octave.

The low cut filter affects the Mic, Line, and Hi-Z inputs. Low Cut is typically used to
eliminate rumble and other unwanted low frequencies from the input signal.

(8) Phantom Power (+48V)

When enabled, 48 volts of phantom power is supplied at the channel’s rear panel XLR
input. Most modern condenser microphones require 48V phantom power to operate. This
option can only be activated when the Mic/Line input switch (#6) is set to Mic.

Caution: To avoid potential equipment damage, disable +48V phantom power on

the channel before connecting or disconnecting its XLR input.

Depending on the current configuration of the hardware and software, there may be a
delay when changing the +48V state to minimize the clicks/pops that are inherent when
engaging phantom power. The +48V switch LED will blink rapidly during any delay.

(9) Pad

When enabled, the channel’s XLR input signal level is attenuated by 20 dB. Pad does
not effect the Line or Hi-Z inputs.

Pad can be used to reduce signal levels when overload distortion is present at low
preamp gain levels, such as when particularly sensitive microphones are used on loud
instruments, and/or if the A/D converter is clipping.

(10) Polarity

When enabled, the polarity (aka phase) of the input channel’s signal is inverted. Polarity
affects the Mic, Line, and Hi-Z inputs.

Tip: Polarity inversion can help reduce phase cancellations when more than one
microphone is used to record a single source.

Apollo x8p Hardware Manual Front Panel 16

(11) Stereo Link

This switch links the preamp controls of adjacent preamp channels together (1+2, 3+4,
5+6, 7+8) to create stereo input pairs. When channels are linked as a stereo pair, any
preamp control adjustments will affect both channels of the stereo signal identically.

Note: Only the same type of inputs can be linked (Mic/Mic or Line/Line). The Hi-Z
inputs cannot be linked.

(12) INPUT Indicators

These indicators (MIC, LINE, HI-Z, Unison 1/2/3) display which hardware input is
currently active for the channel, and whether or not Unison technology is active on the
input.

To select MIC or LINE, use the INPUT switch (#6). To select Hi-Z, plug a ¼” mono
TS cable into the Hi-Z input. To activate Unison, place a Unison UAD plug-in into the
input’s dedicated Unison insert in the Console application.

LINE indicator color

The color of the LINE indicator changes to reflect the state of the LINE INPUT GAIN
setting, which is configured in the Hardware panel within the Console Settings window.

White – LINE INPUT GAIN is ON. The line input is routed through the preamp so the
input gain can be adjusted.

Green – LINE INPUT GAIN is OFF. The preamp circuitry is bypassed and the line
input is fixed at a reference level of +4 dBu. Note that Unison cannot be active on a
channel when its LINE INPUT GAIN is OFF.

Unison Input Indicators

The U1 indicator is lit when a Unison UAD plug-in is active on the currently
selected preamp channel. Unison technology is activated by placing a Unison
UAD plug-in into the dedicated Unison insert for the input channel in the
Console application.

By default, the U1 indicator is lit when the Unison plug-in is active. When Unison’s
Gain Stage Mode is active, the three Unison indicators (U1, U2, U3) show which Unison
plug-in gain parameter can be remotely controlled with the front panel PREAMP knob.

The U2 and U3 indicators illuminate only when the preamp channel is in Unison Gain
Stage Mode. In this state, different Unison plug-in gain stage parameters are selected for
adjustment by pressing the PREAMP knob.

Note: See the Unison chapter within the Apollo Software Manual for complete
details about Unison operation and Gain Stage Mode.

Apollo x8p Hardware Manual Front Panel 17

(13) Channel 1 – 8 Select Indicators

The currently selected preamp channel is indicated by the illuminated numbers above
level meters 1 – 8. When a preamp channel (or channels, when stereo linked) is
selected, its channel number is illuminated. The currently selected channel increments
when the PREAMP knob (#4) is pressed.

(14) Channel Level Meters

The 10-segment LED channel meters display the input or output signal peak levels for
analog channels 1 – 8. Input or output metering is selected with the METER switch
(#20). The input/output state is shown by the METER indicators (#17).

The dB values of the meter LEDs are indicated between the meters for channels 4 and 5.
When digital clipping occurs in input (when 0 dBFS is exceeded), the red “C” (clip) LED
illuminates.

Input Channel Meters

When set to INPUT, the channel meters display the signal peak input levels for analog
channels 1 – 8 at the input to the A/D converters.

Avoid digital clipping at the channel’s A/D converter by reducing the output level of
the device connected to the channel’s input, and/or in the case of channels 1 – 4, by
reducing the preamp gain and/or engaging the Pad (#9) and readjusting gain as needed.

Output Channel Meters

When set to OUTPUT, the channel meters display the signal peak output levels for analog
channels 1 – 8 at the output of the D/A converters.

Apollo x8p Hardware Manual Front Panel 18

MONITOR

METER

ALT

FCN

POWER

OFF

HP 1 HP 2

16 18 19 20

23 24

27

252112

17

22

26

Apollo x8p front panel (right portion)

(15) HOST Indicator

The HOST indicator displays the status of the Thunderbolt connection to the host
computer system. The possible states are:

Lit – The unit is communicating with the host computer and operating normally.

Unlit – The unit is starting up or it is not recognized by the host computer. Verify

software installation and Thunderbolt connections.

Red – System error. Please contact UA technical support if the issue persists.

(16) CLOCK Indicators

The clock source and status are displayed with these indicators. Either internal (INT) or
external (EXT) is displayed. The clock source is set within the Console application; see
the Apollo Software Manual for details.

Internal Clock

When set to internal clock, the INT indicator is illuminated white.

External Clock

Apollo x8p can use an external digital clock source from the Word Clock or optical
TOSLINK (S/PDIF and ADAT) inputs. The EXT indicator has two possible states:

White – When set to external clock and a valid clock signal is detected at the
specified port, the EXT indicator is illuminated white and Apollo x8p is synchronized
to the external clock source.

Red – When set to external clock and a valid clock signal is NOT detected at the
specified port, the EXT indicator is illuminated red and the internal clock remains
active instead. In this situation, if/when the specified external clock becomes
available, Apollo x8p switches back to the external clock, and the EXT indicator is
illuminated and white.

Important: When set to use any external clock source, Apollo x8p’s sample rate

must be manually set to match the sample rate of the external clock.

Apollo x8p Hardware Manual Front Panel 19

(17) METER Indicators

These indicators show the current state of the Channel Level Meters (#14). The current
state is changed with the METER switch (#20).

IN – When IN is illuminated, the channel meters display analog input signal levels.

OUT – When OUT is illuminated, the channel meters display analog output signals

levels.

(18) Sample Rate Indicators

These indicators display the current sample rate setting for A/D and D/A conversion.
The sample rate is set within the Console application or the host DAW; see the Apollo
Software Manual for details.

(19) Monitor Output Level Meters

The 10-segment LED meters display the signal peak output levels of the rear panel Left
& Right Monitor outputs at the output of the D/A converters. These meters are before the
Monitor Level control (pre-fader) and reflect the D/A converter levels regardless of the
current Monitor Level and Headphone Level knob settings.

The dB values of the monitor meter LEDs are indicated between the left and right
channel meters. When digital clipping occurs, the red “C” (clip) LED illuminates.

If the monitor output level clips, reduce the monitor output level within the DAW and/or
reduce the output level of individual channels feeding the monitor output bus within the
Console application.

(20) Meter Switch

This switch determines whether the Channel Level Meters (#14) are displaying input
levels or output signal levels. Pressing the switch toggles the state of the meters and the
Meter Indicators (#17).

Apollo x8p Hardware Manual Front Panel 20

(21) Monitor ALT Switch

When ALT monitoring is configured in the Hardware panel within the Console Settings
window (when ALT COUNT is set to a non-zero value), this switch toggles between the
main monitor outputs and the ALT 1 outputs (line outputs 1 & 2).

When the ALT switch is engaged:

• The monitor signals are routed to outputs 1 & 2 instead of the main monitor outputs.

• The orange LED within the switch is illuminated.

• The Monitor Level Indicator (#24) is orange instead of green.

For complete details about how to configure and use the ALT monitoring features, refer to
the Apollo Software Manual.

Tip: ALT 2 outputs (line outputs 3 & 4) can be selected with the FCN switch
(#22) when configured in Console Settings, or in the MONITOR column within the
Console application.

(22) Monitor Function Switch (FCN)

This is an assignable switch that can be configured to control one of three monitoring
functions. The function of the switch is configured with the FCN SWITCH ASSIGN menu
in the Hardware panel within the Console Settings window. See the Apollo Software

Manual for details.

The amber LED within the switch flashes when the monitoring function is active. The
function is toggled with the switch is pressed again. The available functions are:

ALT 2 – Selects the ALT 2 monitor speakers. The monitor signals are routed to
outputs 3 & 4 instead of the main monitor outputs, and the Monitor Level Indicator
ring (#24) is amber instead of green when ALT 2 is active.

MONO – Sums the left and right channels of the stereo monitor mix into a
monophonic signal. The Monitor Level Indicator ring (#24) flashes when MONO is
active.

DIM – Attenuates the signal level at the monitor outputs by the dB amount set in the
CONTROL ROOM strip within the Console application. The Monitor Level Indicator
ring (#24) flashes when DIM is active.

TALKBACK – Activates the talkback mic and the DIM function. Talkback is active
when the button is lit. Press and release the button quickly to latch talkback ON. To
momentarily activate the function and deactivate when the button is released, press
for longer than 0.5 seconds. The Monitor Level Indicator ring (#24) flashes when
talkback is active.

Note: When more than one Apollo interface is connected in a multi-unit
configuration, the FCN switch is operable on the designated monitor unit only.

Apollo x8p Hardware Manual Front Panel 21

(23) Monitor Level & Mute Knob

This rotary encoder serves two functions. Rotating the knob adjusts the monitor output
level, and pressing the knob mutes the monitor outputs.

Monitor Level

Rotating the knob clockwise increases the signal level at the Left & Right Monitor
Outputs on the rear panel. If ALT monitor outputs are configured and active, this knob
controls the signal level at the ALT monitoring line outputs.

Monitor Mute

Pressing the Monitor knob toggles the mute state of the signals at the Left & Right
Monitor Outputs on the rear panel. If ALT monitoring is configured in the Hardware panel
within the Console Settings window (when ALT COUNT is a non-zero value), the ALT
monitor outputs are also muted by this control.

When the monitor outs are muted, the Monitor Level Indicator ring (#24) is red.

Note: Monitor Mute does not mute the headphone outputs.

(24) Monitor Level & Monitor State Indicator

Tip: The Monitor Level and Monitor State indications are reflected in the Monitor
column within the Console application.

Monitor Output Level Indicator

The relative signal level at the rear panel monitor outputs (and ALT monitor outputs, if
configured) is indicated by the illuminated ring surrounding the Monitor Level knob.

This indicator is after the Monitor Level control (post fader). The ring indicates relative
gain levels and is not calibrated to indicate any specific dB value.

Tip: Precise numerical dB gain values for the Monitor Level Knob are displayed
within the Console application.

Monitor State Indicator

The color of the indicator ring indicates the current state of the monitor outputs:

Green – The main monitor outputs are active with variable level control.

Red – The main monitor outputs (and ALT monitor outputs, if configured) are muted.

Orange – The ALT 1 monitor outputs are active.

Amber – The FCN switch is active and assigned ALT 2.

Flashing – The monitor DIM, MONO, and/or TALKBACK functions are active.

Apollo x8p Hardware Manual Front Panel 22

(25) Headphone Level Knobs 1 & 2

These knobs control the volume of Headphone Outputs 1 & 2 on the front panel. Each
headphone output has its own volume control.

(26) Headphone Outputs 1 & 2

These ¼” stereo TRS phone jacks are for stereo headphones. Headphone outputs 1 & 2
are individually addressable.

By default, both headphone outputs mirror the monitor outputs. When mirroring the
monitor outputs, the headphone outputs are unaffected by Monitor Mute (#23), to
facilitate recording/tracking with headphones while the monitor speakers are muted.

Unique mixes can be created for each headphone output using the CUE functions within
Console or by assigning mix buses from a DAW to the headphone outputs via the device
drivers.

(27) Power Switch

This switch applies power to Apollo x8p. When the unit is powered on, the Universal
Audio logo (#1) is illuminated. The external power supply must be properly connected for
this switch to function.

Apollo x8p Hardware Manual Front Panel 23

Rear Panel

MONITOR

R

L

LINE OUT 1-8 (ALT SURROUND)

LINE IN 1-8

34

35

33

INPUT

MONITOR

HI-Z 2

HI-Z 1

PAD

INPUT

+48V

Ø LINK

4 5 72

3 11

13

17

16 18 19 20

14

1

10

6

8

9 15

1

2 3 4

5

6 7 8

28 31

POWER IN

+12VDC 9.0A

29

ADAT S/MUX

UNIVERSAL AUDIO, INC.

30

75 Ω

TERM

WORD CLOCK

32

Apollo x8p rear panel (digital portion)

(28) Power Input

The included external power supply connects to this 4-pin locking XLR jack. Apollo x8p
requires 12 volts DC power and draws a maximum of 72 watts (30 watts typical).

To eliminate risk of circuit damage, connect only the factory-supplied power supply. Use
the Power switch on the front panel to power the unit on and off.

Important: Do not disconnect the power supply while Apollo x8p is in use,

and confirm the Power switch is in the “off” position before connecting or
disconnecting the power supply.

Apollo x8p Hardware Manual Rear Panel 24

Digital I/O

(29) Optical TOSLINK Ports

The optical TOSLINK ports can use either the ADAT or S/PDIF digital protocols for
interconnecting with other audio hardware devices in the digital domain. Two optical
inputs and two optical outputs are provided.

By default, the ADAT protocol is active for all optical ports. The protocol used by the
optical input and output ports can be individually set in the Hardware panel within the
Console Settings window. See the Apollo Software Manual for details.

Each protocol is detailed below.

ADAT S/MUX Optical I/O

When set to ADAT, the optical ports use the ADAT Lightpipe Optical Interface protocol,
routing a total of eight channels of digital audio. The channels routed by the ports
depend on the current system sample rate.

At sample rates of 44.1 kHz and 48 kHz, the original ADAT protocol is used, and eight
audio channels are routed on one ADAT port. At higher sample rates, industry standard
S/MUX is used to maintain high-resolution transfers.

Important: To utilize all eight channels with the optical ports at sample rates

of 88.2 kHz and above, ADAT ports 1 & 2 must both be connected to the other
device, and the other device must also support the ADAT S/MUX protocol.

The following behaviors apply to the ADAT ports:

• At sample rates of 44.1 kHz and 48 kHz, port 1 supports eight channels of I/O.
Output 2 mirrors output 1, and input 2 is disabled.

• At sample rates of 88.2 kHz and 96 kHz, up to four channels of audio are routed
per port (eight channels total, when both ports are used).

• At sample rates of 176.4 kHz and 192 kHz, up to two channels of audio are
routed per port (four channels total, when both ports are used). Only four ADAT
channels are supported at 176.4 kHz and 192 kHz.

The ADAT port channel assignments described above are summarized in this table:

ADAT PORT CHANNEL ROUTING

Sample Rate (kHz) Input Port 1 Input Port 2 Output Port 1 Output Port 2

44.1 & 48 1 – 8 Disabled 1 – 8 1 – 8 (mirror of port 1)

88.2 & 96 1 – 4 5 – 8 1 – 4 5 – 8

176.2 & 192 1 – 2 3 – 4 1 – 2 3 – 4

Apollo x8p Hardware Manual Rear Panel 25

S/PDIF Optical I/O

When set to S/PDIF, the optical ports use the S/PDIF protocol. The S/PDIF optical ports
provide two channels of digital I/O with resolutions up to 24-bit at 96 kHz.

S/PDIF Sample Rate Conversion

Sample rate conversion can be performed on the S/PDIF input; this setting is enabled
within the S/PDIF channel’s input strip in the Console application. When the sample rate
of the incoming S/PDIF signal does not match the sample rate specified in the Console
application, the S/PDIF signal is converted to match Apollo x8p’s sample rate. If Apollo
x8p is set to use S/PDIF as the master clock source, sample rate conversion is inactive.

Tip: The S/PDIF output can be configured to mirror the Monitor Outputs (#33), for
routing the stereo monitor signal to the stereo S/PDIF input of other devices. This
feature is set with the DIGITAL MIRROR menu in the Hardware panel within the
Console Settings window.

(30) 75 Ohm Word Clock Termination Switch

This switch provides internal 75-ohm word clock input signal termination when required.
Word clock termination is active when the switch is engaged (depressed).

Apollo x8p’s termination switch should only be engaged when Apollo x8p is set to sync
to external word clock and it is the last device at the receiving end of a word clock cable.
For example, if Apollo x8p is the last “slave” unit at the end of a clock chain (when
Apollo x8p’s word clock OUT port is not used), termination should be active.

(31) Word Clock I/O

Word Clock In

Apollo x8p’s internal clock can be synchronized (slaved) to an external master word
clock. This is accomplished by setting Apollo x8p’s clock source to Word Clock within the
Console application, connecting the external word clock’s BNC connector to Apollo x8p’s
word clock input, and setting the external device to transmit word clock. If Apollo x8p is
the last device in the clock chain, the Termination switch (#30) should be engaged.

Important: Apollo x8p’s sample rate must be manually set to match the incoming

clock’s sample rate.

Note: Apollo x8p can be synchronized to an external “1x” clock signal only.
Superclock, overclocking, and subclocking are not supported.

Apollo x8p Hardware Manual Rear Panel 26

Word Clock Out

This BNC connector transmits a standard (1x) word clock when Apollo x8p is set to use
its internal clock. The clock rate sent by this port matches the current system sample
rate, as specified within the Console application.

When Apollo x8p is set to use external word clock as its clock, Apollo x8p is a word clock
slave. If the incoming external word clock is within ±0.5% of a supported sample rate
(44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz, 176.4 kHz, 192 kHz), Word Clock Out will mirror
Word Clock In with a slight phase delay (about 40ns).

Because Apollo x8p’s word clock output is not a true mirror of the word clock input,
word clock out should not be used to daisy chain the word clock if Apollo x8p is in the
middle of the word clock chain. The correct method to connect Apollo x8p in the middle
of a word clock chain is to use a T-connector at Apollo x8p’s word clock input and leave
Apollo x8p’s word clock output unconnected (the Termination switch should not be
engaged in this scenario)

(32) Thunderbolt 3 Ports

Apollo x8p has two Thunderbolt 3 ports. One port is used to connect Apollo x8p to a
Thunderbolt 3 port on the host computer. Thunderbolt 3 peripheral devices may be
serially connected (daisy-chained) to the second Thunderbolt 3 port.

When Apollo x8p is properly communicating with the host computer via Thunderbolt, the
HOST indicator (#15) illuminates.

Note: Apollo x8p can be used with Thunderbolt 1 and Thunderbolt 2 ports on
Apple Mac computers via the Apple Thunderbolt 3 to Thunderbolt 2 Adapter.
Connections to Thunderbolt 1 or Thunderbolt 2 ports on Windows PCs are not
supported.

Thunderbolt Bus Power

Per the Thunderbolt specification, bus power is supplied to downstream (daisy-chained)
Thunderbolt peripheral devices. Apollo x8p must be powered on for the daisy-chained
peripheral to receive Thunderbolt bus power.

Apollo x8p Hardware Manual Rear Panel 27

Analog I/O

INPUT

MONITOR

PAD

INPUT

+48V

Ø LINK

METER

ALT

FCN

POWER

OFF

HP 1 HP 2

13

17

16 18 19 20

22

23 24

26

27

252112

14

10

9 15

1

2 3 4

5

6 7 8

33

L

MONITOR

R

34

LINE OUT 1-8 (ALT SURROUND)

LINE IN 1-8

36

MIC/LINE INPUT

35

Apollo x8p rear panel (analog portion)

(33) Left & Right Monitor Outputs

These balanced ¼” TRS phone jacks are line-level analog outputs typically used for
connection to a stereo loudspeaker monitoring system. Unbalanced ¼” TS cables can
also be used. The Monitor Outputs are DC coupled.

The signal levels and muting at these outputs are controlled with the Monitor Level &
Mute knob (#23).

12345678

The Monitor Outputs can be configured to use an operating level of +4 dBu (default
value) or -10 dBV. This option is set in the Hardware panel within the Console Settings
window. See the Apollo Software Manual for details.

The Monitor Outputs are completely independent and separately addressable from
the eight Line Outputs (except when ALT monitoring is configured). By default, these
outputs are labeled MON L and MON R in Apollo’s device drivers. In the DAW, the “1–2”
or “L–R” or “Main” outputs are routed to these outputs (these labels vary within each
particular DAW).

Tip: The S/PDIF output (#29) can be configured to mirror the Monitor Outputs, for
routing the stereo monitor signal to the stereo S/PDIF input of other devices. This
feature is set with the DIGITAL MIRROR menu in the Hardware panel within the
Console Settings window.

Apollo x8p Hardware Manual Rear Panel 28

(34) DB25 Line Outputs 1 – 8

The eight line-level analog outputs are accessed via this female DB25 connector. The
DB25 jack carries eight balanced line-level channel outputs using standardized Tascam
wiring. All Line Outputs are DC coupled.

Note: See DB25 Wiring for connector pinouts.

Line Output Headroom

By default, the operating level of the line outputs is +20 dBu. The line
outputs and inputs can be globally configured to operate at +24 dBu
signal levels with the HEADROOM menu in the Settings>Hardware
panel within the Console application.

+24 dBu operation is typically used for interfacing with professional
audio equipment such as large format consoles, analog tape machines,
and similar devices that require higher signal levels. For additional
details about +24 dBu operation, see the Apollo Software Manual.

Line Output Reference Levels

The Line Outputs can be configured in adjacent pairs to use either –10 dBV or +4 dBu
reference levels. This function is configured in the Hardware panel within the Console
Settings window. See the Apollo Software Manual for details.

Headroom menu

within Console Settings

ALT Outputs 1 – 4

Apollo x8p features ALT (alternate) monitoring capabilities. ALT monitoring can be used
to control up to two alternate pairs of monitor speakers.

When ALT monitoring is enabled, the output level and muting of line outputs 1 & 2
(ALT 1) and 3 & 4 (ALT 2) are controlled by the Monitor Level & Mute knob (#23). ALT
monitoring is enabled in the Hardware panel within the Console Settings window by
increasing the ALT COUNT setting to a non-zero value.

Apollo x8p Hardware Manual Rear Panel 29

Analog Inputs Overview

The analog preamp channel 1 – 8 inputs can be accessed via individual XLR/TRS combo
jacks or a single DB25 connector.

Each preamp channel accepts a mic or line input. Mic inputs use the XLR jacks, while
line inputs can use the TRS jacks or the DB25 connector. The front panel INPUT switch
(#6) is used to select mic or line input for a channel.

Important: To use a ¼” or DB25 line input, the channel’s INPUT indicator (#12)

must be set to LINE with the INPUT switch (#6) or the channel’s MIC/LINE
switch within the Console application.

Using the XLR and DB25 inputs facilitates simultaneous connection of mic and line
cables to the same input channel, enabling the ability to switch between mic and line
inputs without cable re-patching.

Analog Inputs 1 – 8 Gain

XLR Input Gain

The XLR mic inputs 1 – 8 are always routed into the channel’s microphone preamplifier.
The gain is controlled by the PREAMP knob (#4) when the channel is selected, or the
Console application. The mic preamps provide up to 65 dB of gain.

¼” & DB25 Input Gain

Line inputs 1 – 8 can be individually routed into the channel’s preamplifier for variable
gain adjustments, or the preamp circuitry can be completely bypassed for the purest
path directly into the A/D converter. This option is set with the LINE INPUT GAIN menu
in the Hardware panel within the Console Settings window. By default, line inputs 1 – 8
are routed into the preamp.

When the preamps are bypassed, line inputs 1 – 8 operate at a fixed reference level
of +4 dBu. When routed into the preamps, gain for line inputs 1 – 8 is continuously
variable with up to 65 dB of available gain.

Note: For related information, see Line Input Gain Bypass.

Line Inputs Headroom

By default, the operating level of the line inputs is +20 dBu. The line
inputs and outputs can be globally configured to operate at +24 dBu
signal levels with the HEADROOM menu in the Settings>Hardware
panel within the Console application.

+24 dBu operation is typically used for interfacing with professional
audio equipment such as large format consoles, analog tape machines,
and similar devices that require higher signal levels. For additional
details about +24 dBu operation, see the Apollo Thunderbolt Software
Manual.

Headroom menu

within Console Settings

Apollo x8p Hardware Manual Rear Panel 30

(35) DB25 Line Inputs 1 – 8

The line inputs can be accessed via this female DB25 connector. The single DB25 jack
carries eight balanced line-level channel inputs using standardized Tascam wiring.

Note: For connector pinouts, see DB25 Wiring.

The DB25 line inputs are normalled to the TRS combo jacks. If a DB25 line input is
active and a 1/4” cable is plugged into the same channel’s combo jack input, the DB25
input is disconnected and the combo jack input is used instead.

Important: To use a DB25 line input, the channel’s input must be set to LINE and

its ¼” connector (including Hi-Z input) must not be connected.

(36) Mic/Line Combo Inputs 1 – 8

XLR plugs are routed to the channel’s microphone input, and TRS plugs are routed to the
channel’s line input.

Combo jack inputs 1 – 8 are switched between the XLR and Line connections using the
front panel Input switch (#6) or the Console application.

XLR Mic Inputs 1 – 8

The combo jack balanced Microphone inputs accept XLR plugs. Pin 2 is wired positive
(hot).

+48V phantom power is available for the XLR inputs via the front panel switch (#6) or
the Console application.

Caution: To avoid potential equipment damage, disable +48V phantom power on

the channel before connecting or disconnecting its XLR input.

¼” Line Inputs 1 – 8

The combo jack line inputs 1 – 8 accept balanced ¼” TRS phone plugs. Unbalanced ¼”
TS plugs can also be used.

Apollo x8p Hardware Manual Rear Panel 31

Interconnections

Installation Notes

• Apollo X may get hot during normal operation if it doesn’t receive adequate airflow
circulation around its chassis vents. For optimum results when mounting Apollo X
in a rack, leaving at least one empty rack space above the unit to allow adequate
airflow for cooling is strongly recommended.

• If Apollo X is installed near other heat generating equipment, external cooling
(such as a fan) may be needed to keep the ambient temperature below 104ºF
(40ºC).

• As with any sound system, the following steps are recommended to avoid audio
spikes in your speakers and headphones:

1. Apply power to the speakers last, after all other devices (including Apollo x8p)

are powered on.

2. Turn off the speakers first, before all other devices (including Apollo x8p) are

powered off.

3. Remove headphones from ears before powering Apollo x8p on or off.

Connection Notes

Thunderbolt

• Apollo X must be connected via a Thunderbolt 3 cable (not included) to
computers that have an available Thunderbolt 3 port.*

• Connect only one Thunderbolt 3 cable between Apollo X and the host computer.
Thunderbolt is a bidirectional protocol.

• Apollo X cannot be bus powered via Thunderbolt. The included external power
supply must be used.

• Thunderbolt bus power is supplied to downstream (daisy-chained) peripheral
devices. Apollo X must be powered on for the daisy-chained peripheral to receive
Thunderbolt bus power.

*Note: With Mac computers only, Apollo X can be connected to Thunderbolt 1
and Thunderbolt 2 computer ports via the Apple Thunderbolt 3 to Thunderbolt 2
adapter. Visit help.uaudio.com for details.

Apollo Expanded

• When more I/O and/or DSP is needed, up to four Apollo interfaces and six
UAD devices total can be cascaded together via Thunderbolt in a multiple-unit
configuration. For complete details about multi-unit cascading, refer to the Apollo
Thunderbolt Software Manual.

Apollo x8p Hardware Manual Interconnections 32

About Thunderbolt 3 Ports and Cables

Important: Although Thunderbolt 3 always uses USB-C connectors, not all USB-C

ports are Thunderbolt 3 ports. Similarly, not all USB-C cables are Thunderbolt 3
cables. Always connect Apollo x8p to a Thunderbolt 3 port with a Thunderbolt 3
cable.

USB-C is not Thunderbolt 3

Thunderbolt 3 uses USB-C connections to transfer data and power. However, USB-C is
simply a connector type; it doesn’t determine the type of data used by the connector. For
example, USB-C connections can be used for Thunderbolt 3, USB 3.1, and other data
protocols, so USB-C connections are not always interchangeable.

Does your USB-C connector support Thunderbolt 3?

To determine if a USB-C port or cable connector supports Thunderbolt 3, look
for the Thunderbolt icon. The Thunderbolt icon on a USB-C port or cable
means the connector supports Thunderbolt 3. Alternately, confirm Thunderbolt
3 compatibility with the device and/or cable manufacturer.

Thunderbolt icon on USB-C cable (left) and USB-C port (right)

Apollo x8p Hardware Manual Interconnections 33

Typical Setup

INPUT

MONITOR

HI-Z 2

HI-Z 1

PAD

INPUT

+48V

Ø LINK

METER

ALT

FCN

POWER

OFF

HP 1 HP 2

INPUT

MONITOR

HI-Z 2

HI-Z 1

PAD

INPUT

+48V

Ø LINK

METER

ALT

FCN

POWER

OFF

HP 1 HP 2

S/PDIF

ADAT S/MUX

POWER IN

+12VDC 9.0A

WORD CLOCK

35

6 4

2

1

MONITOR

R

L

4

6 2

135

1

2

75 Ω

TERM

OUTPUT (ALT/SURROUND)

7

LINE INPUT

8

7

4 3

MIC INPUT

UNIVERSAL AUDIO, INC.

INPUT

MONITOR

HI-Z 2

HI-Z 1

PAD

INPUT

+48V

Ø LINK

METER

ALT

FCN

POWER

OFF

HP 1 HP 2

S/PDIF

ADAT S/MUX

POWER IN

+12VDC 9.0A

WORD CLOCK

35

6 4

2

1

MONITOR

R

L

4

6 2

135

1

2

75 Ω

TERM

OUTPUT (ALT/SURROUND)

7

LINE INPUT

8

7

4 3

MIC INPUT

UNIVERSAL AUDIO, INC.

MONITOR

R

L

POWER IN

+12VDC 9.0A

WORD CLOCK

75 Ω

TERM

LINE OUT 1-8 (ALT SURROUND)

LINE IN 1-8

12345678

MIC/LINE INPUTADAT S/MUX

UNIVERSAL AUDIO, INC.

Headphones 2

Instrument 1

Instrument 2

Headphones 1

Thunderbolt 3

Computer

MicMic

Monitor Speakers

The diagram below illustrates an Apollo x8p setup example that could be used for
recording an ensemble. ALT monitors are connected for comparing different speakers to
the DB25 line outputs via a DB25 audio breakout snake.

Thunderbolt 3

Instrument 1

Computer

ALT Monitor

Speakers

Thunderbolt

Peripheral

Instrument 2

Monitor

Speakers

DB25 Audio

Snake

Stereo Keyboard

Headphones 1

MicMicMic

Mic

Headphones 2

Typical Apollo x8p connections

Apollo x8p Hardware Manual Interconnections 34

Apollo Expanded: Multi-Unit Thunderbolt 3 Wiring

S/PDIF

ADAT S/MUX

POWER IN

+12VDC 9.0A

WORD CLOCK

35

6 4

2

1

MONITOR

R

L

4

6 2

135

1

2

75 Ω

TERM

OUTPUT (ALT/SURROUND)

7

LINE INPUT

8

7

4 3

MIC INPUT

UNIVERSAL AUDIO, INC.

MONITOR

R

L

POWER IN

+12VDC 9.0A

WORD CLOCK

75 Ω

TERM

LINE OUT 1-8 (ALT SURROUND)

LINE IN 1-8

12345678

MIC/LINE INPUTADAT S/MUX

UNIVERSAL AUDIO, INC.

MIC/LINE 1

MIC/LINE 2

3 L

4 R

LINE OUT MONITOR

OPTICAL IN

OFF ON

POWER

The diagram below illustrates an example of how to interconnect multiple Apollo units
and the host computer via Thunderbolt 3.

Important: For complete details about system operation when multi-unit

cascading, see the Apollo Software Manual.

Thunderbolt 3

Computer

TB3 to TB2 Adapter

TB3 to TB2 Adapter

Expander Unit

Connecting multiple Apollo X units via Thunderbolt 3

Apollo Expanded Wiring Notes

UAD-2 Satellite Thunderbolt

ALT Speakers

Monitor Speakers

Expander Unit

Monitor Unit

IMPORTANT: Connect speakers

and cue outputs to Monitor Unit ONLY

• Apollo device ordering and Thunderbolt ports used (second port on Apollo vs.
second port on computer, placement within daisy chain, etc) is not important.

• In this example diagram, an Apollo x8 is the monitor (master) unit designated in
the Console Settings window. Connect speakers (including ALT speakers) and any
cue outputs to the monitor unit only.

• Do not interconnect any Word Clock, FireWire, ADAT, or MADI ports between any
Apollo units. All Apollo clocking is automatically managed via Thunderbolt.

• Up to four Apollo units and six UAD devices total can be combined within the
same system.

• The computer and all Apollo/UAD units must be connected to the same
Thunderbolt bus.

• Apollo X-series units with Thunderbolt 3 can be mixed with older Apollo units with
Thunderbolt 2 by using compatible Thunderbolt 3 to Thunderbolt 2 adapters.

Note: On Mac systems only, Apollo X can be connected to Thunderbolt 1 and
Thunderbolt 2 computers via the Apple Thunderbolt 3 to Thunderbolt 2 adapter.
Visit help.uaudio.com for details.

Apollo x8p Hardware Manual Interconnections 35

Software Setup

Note: Items on this page are detailed in the Apollo Software Manual.

System Requirements

All system requirements must be met for Apollo X to operate properly. Before proceeding
with installation, see the system requirements in the Apollo Software Manual.

Software Installation

The software must be installed to use the hardware and UAD plug-ins. The UAD Powered
Plug-Ins software installer contains the Apollo X software, drivers, and UAD plug-ins.

Registration and Authorization

Apollo X must be registered and authorized to unlock UAD plug-ins that are bundled with
the product. To register and authorize Apollo x8p, visit:

• www.uaudio.com/register

Note: For optimum results, connect and power on Apollo X before installing the
software.

Latest Software

To obtain the latest UAD installer after initial registration, visit:

• www.uaudio.com/downloads

System Configuration

Complete details about setting up the Apollo X system, including how to integrate with a
DAW and related information, are included in the Apollo Software Manual.

Console Application

The included Console application is the software interface for the Apollo X hardware.
Console controls Apollo X and its digital mixing, monitoring, and Realtime UAD
Processing features. Console is also used to configure Apollo X I/O settings such as
sample rate, clock source, and reference levels.

For complete details about how to operate Console, refer to the Apollo Software Manual.

UA Support Videos

Informational videos are available to help you get started with Apollo X:

• help.uaudio.com

Apollo x8p Hardware Manual Software Setup 36

Specifications

All specifications are typical performance unless otherwise noted. Tested with the Audio
Precision APx555 Audio Analyzer under the following conditions: 48 kHz internal
sample rate, 24-bit sample depth, 20 kHz measurement bandwidth, +24 dBu headroom,
balanced output, and internal clock.

SYSTEM

I/O Complement

Microphone Inputs Eight

High Impedance (Hi-Z) Instrument Inputs Two

Analog Line Inputs Eight

Analog Line Outputs (DC coupled) Eight (ten including Monitor outputs)

Analog Monitor Outputs (DC coupled) Two (one stereo pair)

Headphone Outputs Two stereo

Digital Input Ports (TOSLINK optical) Two (ADAT or S/PDIF, selectable)

Digital Output Ports (TOSLINK optical) Two (ADAT or S/PDIF, selectable)

Thunderbolt 3 Ports Two

Word Clock One input, one output

A/D – D/A Conversion

Simultaneous A/D conversion Eight channels

Simultaneous D/A conversion 14 channels

Supported Sample Rates (kHz) 44.1, 48, 88.2, 96, 176.4, 192

Bit Depth Per Sample 24

Analog Round-Trip Latency 1.1 milliseconds @ 96 kHz sample rate

Analog Round-Trip Latency through four UAD
legacy plug-ins (included) via Console software

1.1 milliseconds @ 96 kHz sample rate (no
additional latency via Realtime UAD Processing)

(continued)

Apollo x8p Hardware Manual Specifications 37

ANALOG I/O

Microphone Inputs 1 – 8

Frequency Response 20 Hz – 20 kHz, ±0.05 dB
Dynamic Range 122 dB (A–weighted)
Total Harmonic Distortion + Noise Ratio (1 kHz @ 4.9 dBu) -114 dB (0.00020%)
Maximum Input Level (PAD on) 26 dBu
Default Input Impedance 5.4K Ohms (variable via Unison plug-ins)
Gain Range +10 dB to +65 dB
Pad Attenuation (switchable per input) 20 dB (variable via Unison plug-ins)
Phantom Power +48V (switchable per mic input)
Connector Type XLR Female, pin 2 positive (Combo XLR/TRS)

Hi-Z Inputs 1 – 2

Frequency Response 20 Hz – 20 kHz, ±0.04 dB
Dynamic Range 121 dB (A–weighted)
Total Harmonic Distortion + Noise Ratio (1 kHz @ 11.2 dBu) -111 dB (0.00028%)
Maximum Input Level 12.4 dBu
Default Input Impedance 1M Ohms (variable via Unison plug-ins)
Gain Range +10 dB to +65 dB
Connector Type ¼” Female TS Unbalanced

Line Inputs 1 – 8

Frequency Response 20 Hz – 20 kHz, ±0.04 dB
Dynamic Range 123 dB (A–weighted)
Total Harmonic Distortion + Noise Ratio (1 kHz @ 23 dBu) -113 dB (0.00022%)
Maximum Input Level 24 dBu
Input Impedance 10K Ohms
Gain Range +10 dB to +65 dB
Connector Type (8) ¼” Female TRS Balanced (Combo XLR/TRS)

(1) Female DB25 (Tascam wiring), Normalled

Line Outputs 1 – 8

Frequency Response 20 Hz – 20 kHz, ±0.07 dB
Dynamic Range 127 dB (A–weighted)
Total Harmonic Distortion + Noise Ratio (1 kHz @ -1 dBFS) -119 dB (0.00011%)
Maximum Output Level 24 dBu
Output Impedance 100 Ohms
Connector Type Female DB25 (Tascam wiring)

Monitor Outputs 1 – 2

Frequency Response 20 Hz – 20 kHz, ±0.06 dB
Dynamic Range 129 dB (A–weighted)
Total Harmonic Distortion + Noise Ratio (1 kHz @ -1 dBFS) -118 dB (0.00012%)
Maximum Output Level 24 dBu
Output Impedance 100 Ohms
Connector Type ¼” Female TRS Balanced

Stereo Headphone Outputs 1 – 2

Frequency Response 20 Hz – 20 kHz, ±0.05 dB
Dynamic Range 125 dB (A–weighted)
Total Harmonic Distortion + Noise Ratio (1 kHz @ -1 dBFS) -102 dB (0.00080%)
Maximum Output Power (into 300 ohm load) 150 mW RMS
Connector Type ¼” Female TRS Stereo

(continued)

Apollo x8p Hardware Manual Specifications 38

DIGITAL I/O

S/PDIF

Connector Type (shared with ADAT) Optical TOSLINK JIS F05

Format IEC 958

Supported Sample Rates (kHz) 44.1, 48, 88.2, 96

ADAT

Connector Type (shared with S/PDIF) Optical TOSLINK JIS F05

Format ADAT Digital Lightpipe with S/MUX

Supported Sample Rates (kHz) 44.1, 48, 88.2, 96, 176.4, 192

Channel Assignments @ 44.1 kHz, 48 kHz Port 1 = Channels 1 – 8, Port 2 = 1 – 8 (mirrored)

Channel Assignments @ 88.2 kHz, 96 kHz Port 1 = Channels 1 – 4, Port 2 = Channels 5 – 8

Channel Assignments @ 176.4 kHz, 192 kHz Port 1 = Channels 1 – 2, Port 2 = Channels 3 – 4

Word Clock

Connector Type BNC

Lock Range ±4% of any supported sample rate

Word Clock Input Termination 75 Ohms, switchable

Synchronization Sources

Internal, Word Clock, ADAT, S/PDIF

(continued)

Apollo x8p Hardware Manual Specifications 39

ELECTRICAL

Power Supply External AC-to-DC Power Supply, Level VI compliant

AC Input Connector Type IEC Male

AC Requirements 100V – 240V AC, 50 – 60 Hz

DC Connector Type XLR 4-Pin Locking Male (Neutrik P/N NC4MDM3-H)

DC Requirements 12 VDC, 6A

Maximum Power Consumption 72W (30W typical)

ENVIRONMENTAL

Ambient Temperature Range 32º to 104º F (0º to 40º C)

MECHANICAL

Dimensions

Width 19 in (48,26 cm)

Height (1U rack space) 1.75 in (4,45 cm)

Depth, Chassis Only 12.125 in (30,80 cm)

Depth, Including Knob & Jack Protrusions 13.5 in (34,29 cm)

Shipping Box (Width x Depth x Height)

Shipping Weight (with box & accessories)

Weight (bare unit) 9 lbs (4.08 kg)

Apollo x8p Audio Interface Unit

External Power Supply

AC Power Cable (IEC), Region Specific

Set of (4) Rack-Mount Screws

Getting Started URL Card

23.5 in x 17 in x 7.5 in
(59,69 cm x 43,18 cm x 19,05 cm)

Weight

USA: 16.6 lbs (7.52 kg)
EU & UK: 16.9 lbs (7.64 kg)

Package Contents

Apollo x8p Hardware Manual Specifications 40

Block Diagram

OUT

1/4” TRS

MONITOR

SELECT

VOLUME

-4dB

HEADROOM SELECT

Pad Works on

PAD

D/A

Global Setting

MONITOR OUTPUTS

+4dBu / -10dBV

OUTPUT

+20dBu / +24dBu

OPTOOPTOOPTOOPTO

S/PDIF / ADAT OUT

S/PDIF / ADAT IN

LINE OUT

Stereo Pairs

LINE OUTPUTS 1 - 8

+4dBu / -10dBV

+20dBu / +24dBu

SELECT

-4dB

HEADROOM SELECT

D/A

PAD

PLL

DB25

HP OUT

FEMALE

1/4” TRS

HEADPHONES 1 & 2 L/R

Stereo Pairs

Pad Works on

6 DRAM’s

D/A

DSP’s

Global Setting

OUTPUT

VOLUME

6 SHARC®

MIXER

CLOCKING / SYNC

SYSTEM CONTROL

ARM®

PROCESSOR

FRONT PANEL

3

TM

OPTION CARD

THUNDERBOLT

PCIe OPTION CARD SLOT

TBTB

3 PORTS

TM

THUNDERBOLT

BNCBNC

WORD CLOCK I/O

ø

CONTROL

POLARITY

ON/OFF

LOW-CUT

Global Setting

+4dB

+20dBu / +24dBu

HEADROOM SELECT

A/D

PGA

BYPASS

PGA

10 – 65 dB

INPUT GAIN

SELECT

SELECT

IN/OUT

MIC IN

Unison™

PAD

XLR FEMALE

MIC-LINE/HI-Z

MIC/LINE

MIC PAD

+48V

+48V ON/OFF

INPUT CHANNELS 1 - 2

AMPLIFIER

PGA = PROGRAMMABLE-GAIN

(MIC)

SWITCHING

IMPEDANCE

LINE IN

VCO

HI-Z IN

1/4” TRS

AUDIO

CLOCK

OSCILLATORS

IF PLUG INSERTED IN HI-Z JACK

HI-Z AUTOMATICALLY SELECTED

(HI-Z)

Unison™

SWITCHING

IMPEDANCE

1/4” TS

CLOCKS

ø

CONTROL

POLARITY

ON/OFF

LOW-CUT

Global Setting

+4dB

+20dBu / +24dBu

HEADROOM SELECT

A/D

PGA

BYPASS

PGA

10 – 65 dB

INPUT GAIN

Unison™

SELECT

MIC/LINE

IN/OUT

MIC PAD

+48V

+48V ON/OFF

INPUT CHANNELS 3 - 8

MIC IN

PAD

SWITCHING

IMPEDANCE

LINE IN

XLR FEMALE

(MIC)

1/4” TRS

INTERNAL

TALKBACK MIC

LINE INPUT CHANNELS 1 – 8 (DB25)

DB25 Inputs are

Line In TRS Jacks

Normalled Through

75 Ω

WC TERM ON/OFF

V02

1/4” TRS

DB25

Apollo x8p Hardware Block Diagram

FEMALE

Apollo x8p Hardware Manual Block Diagram 41

DB25 Wiring

Apollo x8p’s line inputs and outputs can be accessed via 25-pin D-sub female
connectors. Each DB25 jack carries eight balanced line-level audio channels on the
standardized Tascam pinouts also used with Digidesign and Avid products.

DB25 Connector Pin Numbers

The pin numbers for female DB25 connectors are shown in the diagram below. When
facing the Apollo x8p rear panel, pin 1 is the upper rightmost pin.

13 1

1425

Apollo x8p female DB25 pin numbers

DB25 Connector Wiring

The signals carried on the female DB25 connector pins are listed in the table below.
Pinouts are identical for inputs and outputs.

Apollo x8p DB25 Connector Pinouts

Pin Channel Signal Pin Channel Signal Pin Channel Signal

1 8 Hot 9 3 Cold 17 6 Cold

2 8 Ground 10 2 Hot 18 5 Hot

3 7 Cold 11 2 Ground 19 5 Ground

4 6 Hot 12 1 Cold 20 4 Cold

5 6 Ground 13 – No Connect 21 3 Hot

6 5 Cold 14 8 Cold 22 3 Ground

7 4 Hot 15 7 Hot 23 2 Cold

8 4 Ground 16 7 Ground 24 1 Hot

25 1 Ground

Apollo x8p Hardware Manual

DB25 Wiring 42

Troubleshooting

If Apollo x8p isn’t behaving as expected, here are some common troubleshooting items to
confirm. If you are still experiencing issues after performing these checks, contact Technical

Support.

SYMPTOM ITEMS TO CHECK

Unit won’t power on • Confirm power supply connections at power supply input and back of unit

• Confirm Power switch is in UP position

• Confirm AC power is available at wall socket by plugging in a different device

No monitor output • Confirm connections, power, and volume of monitoring system

• Confirm monitor knob is turned up

• Confirm monitor outputs are not muted (push monitor knob)

• Confirm monitor LEDs are active (check signal flows)

Can’t hear preamp channels • Confirm preamp gain is turned up for the channel(s)

• Confirm MUTE is not engaged in Console input channel strip

Can't hear mic or line input(s) • Confirm mic/line switch setting is correct for the channel

• Confirm nothing is plugged into the channel’s Hi-Z input

• Confirm MUTE is not engaged in Console input channel strip

Can't hear Hi-Z input(s) • Confirm volume on connected device is turned up

• Confirm Hi-Z input cable is 1/4” TS only (not TRS)

• Confirm MUTE is not engaged in Console input channel strip

Can’t hear mic input(s) • Confirm +48V phantom power is enabled (if required by microphone)

Preamp controls have no effect
on channel

Can only adjust preamp input
channels

Audio glitches and/or dropouts
during playback

Undesirable echo/phasing • Confirm only one input monitoring system is enabled (Console or DAW – not both)

HOST indicator is unlit or red • Confirm Thunderbolt 3 connections

Static and/or white noise is heard
when nothing is plugged in

Various LEDs inside the unit are
blinking

• Confirm desired channel is selected for control (push PREAMP knob to select)

• Preamp controls are not available for non-preamp channels

• Signal levels for all non-preamp inputs, including digital inputs, are adjusted at the
device connected to those inputs

• Increase audio buffer size setting

• Confirm clocking setups; check cable connections and confirm all device clocks are
synchronized to one master clock device

• Confirm Apollo X software is installed

• Power Apollo X off then on, and restart computer

• Reinstall Apollo X software

• Try a different Thunderbolt 3 cable

• Mute or lower preamp gain to minimum on all unused preamp channels (mic preamps
can emit noise even when nothing is plugged in)

• Some UAD plug-ins model the noise characteristics of the original equipment. Defeat
the noise model in the UAD plug-in GUI, or mute the channel containing the plug-in to
temporarily mute the noise

• This is normal operational behavior that can be safely ignored

Apollo X is behaving
unexpectedly

• As a last resort, perform a hardware reset on the unit by following these steps:

1. Power off Apollo X

2. Press and hold the PREAMP, LOW CUT, and POLARITY controls

3. Power on Apollo X while continuing to hold all three controls

4. After all front panel LEDs flash rapidly (after several seconds), release the controls

Apollo x8p Hardware Manual Troubleshooting 43

Notices

Warranty

Universal Audio provides a limited warranty on all UA hardware products. To learn more,
visit help.uaudio.com. The limited warranty gives you specific legal rights. You may also
have other rights which vary by state or country.

Repair Service

If you are having trouble with Apollo X, first check all system setups, connections, and
operating instructions. If that doesn’t help, contact our technical support team.

To learn about repair service, or for technical support, visit help.uaudio.com.

Maintenance

• CAUTION: To reduce the risk of electric shock, do not open the unit.

• Apollo X does not contain a fuse or any other user-replaceable parts. The unit is
internally calibrated at the factory. No internal user adjustments are available.

Apollo x8p Hardware Manual Notices 44

Important Safety Information

Before using this unit, be sure to carefully read the applicable items of these
operating instructions and the safety suggestions. Afterwards, keep them handy for
future reference. Take special care to follow the warnings indicated on the unit, as
well as in the operating instructions.

1) Read these instructions.

2) Keep these instructions.

3) Heed all warnings.

4) Follow all instructions.

5) Do not use this apparatus near water.

6) Clean only with dry cloth.

7) Do not block any ventilation openings. Install in accordance with the manufacturer’s
instructions.

8) Do not install near any heat source such as radiators, heat registers, stoves, or other
apparatus (including amplifiers) that produce heat.

9) Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized
plug has two blades with one wider than the other. A grounding type plug has two
blades and a third grounding prong. The wide blade or the third prong are provided for
your safety. If the provided plug does not fit into your outlet, consult an electrician for
replacement of the obsolete outlet.

10) Protect the power cord from being walked on or pinched particularly at plugs, conve­nience receptacles, and the point where they exit from the apparatus.

11) Only use with attachments/accessories specified by the manufacturer.

12) Use only with the cart, stand, tripod, bracket, or table specified by the manufacturer,
or sold with the apparatus. When a cart is used, use the caution when moving the cart/
apparatus combination to avoid injury from tip-over.

13) Unplug this apparatus during lightning storms or when unused for long periods of
time.

14) Refer all servicing to qualified service personnel. Servicing is required when the
apparatus has been damaged in any way, such as power-supply cord or plug is damaged,
liquid has been spilled or objects have fallen into the apparatus, the apparatus has been
exposed to rain or moisture, does not operate normally, or has been dropped.

Description of symbols used

The lightning flash represented by the arrow symbol in an equilateral triangle is
intended to alert users to the presence of high voltage within the unit that could
cause an electrical shock hazard.

The exclamation mark in an equilateral triangle is intended to alert users to the
existence of important instructions in the manual relating to the use and mainte­nance of the unit.

Apollo x8p Hardware Manual Notices 45

FCC Compliance

Federal Communications Commission
United States Class A Manual Statements

Note: This equipment has been tested and found to comply with the limits for a Class
A digital device pursuant to Part 15 of the FCC Rules. These limits are designed to
provide reasonable protection against harmful interference when the equipment is
operated in a commercial environment. This equipment generates, uses, and can radiate
radio frequency energy and, if not installed and used in accordance with the instruction
manual, may cause harmful interference to radio communications. Operation of this
equipment in a residential area is likely to cause harmful interference to radio commu­nications. Operation of this equipment in a residential area is likely to cause harmful
interference in which case the user will be required to correct the interference at their
own expense.

Any modifications to the unit, unless expressly approved by Universal Audio, could void
the User’s authority to operate the equipment.

• Canada: Innovation, Science and Economic Development Canada Interference
Causing Equipment Standard ICES-003, Issue 6, dated January 2016 (class A)

• Japan: VCCI-CISOR 32:2016, “Technical Requirements” for multimedia equip­ment (class A)

• EN 55022:2010, “Information technology equipment – Radio disturbance char­acteristics – Limits and method of measurements” (Class A)

• CISPR 22:2008, “Information technology equipment – Radio disturbance charac­teristics – Limits and method of measurement” (Class A)

• EN 55032:2010, “Electromagnetic compatibility of multimedia equipment –
Emission Requirements”

• CISPR 32:2010, “Electromagnetic compatibility of multimedia equipment –
Emissions requirements”

• EN 55024:2010, “Information technology equipment – Immunity characteristics.
Limits and method of measurement”

• CISPR 24:2010 +A1:2015, “Information technology equipment – Immunity char­acteristics. Limits and method of measurement.”

• TCVN 7189:2009, “Information technology equipment – Radio disturbance char­acteristics – Limits and method of measurements”

• Korea: KN32/KN35: 2015, Multimedia Class A

Apollo x8p Hardware Manual Notices 46

Disclaimer

The information contained in this manual is subject to change without notice. Universal
Audio, Inc. makes no warranties of any kind with regard to this manual, including, but
not limited to, the implied warranties of merchantability and fitness for a particular
purpose. Universal Audio, Inc. shall not be liable for errors contained herein or direct,
indirect, special, incidental, or consequential damages in connection with the furnishing,
performance, or use of this material.

End User License Agreement

Your rights to the Software are governed by the accompanying End User License Agree­ment, a copy of which can be found at: www.uaudio.com/eula

Trademarks

Universal Audio, the Universal Audio “diamond” logo, Apollo, Apollo Twin, Arrow, UAD,
UAD Powered Plug-Ins, UAD-2 Live Rack, Powered Plug-Ins, Unison technology, 1176,
1176LN, LA-2A, LA-3A, OX, OX Amp Top Box, Century Tube Channel Strip, DreamVerb,
EQP-1A, Helios, Oxide, Teletronix, and “Analog Ears | Digital Minds,” are among the
trademarks, trade names, and service marks owned by UA, many of which are registered
in the United States and in other countries. This is not a comprehensive list of all UA
trademarks. All other trademarks depicted herein are property of their respective owners.

Copyright

Copyright ©2019 Universal Audio, Inc. All rights reserved.

This manual and any associated software, artwork, product designs, and design concepts
are subject to copyright protection. No part of this document may be reproduced, in any
form, without prior written permission of Universal Audio, Inc.

Apollo x8p Hardware Manual Notices 47

Technical Support

Universal Audio Knowledge Base

The UA Knowledge Base is your complete technical resource for configuring, operating,
troubleshooting, and repairing UA products.

You can watch helpful support videos, search the Knowledge Base for answers, get
updated technical information that may not be available elsewhere, and more.

UA Knowledge Base

YouTube Support Channel

The Universal Audio Support Channel at youtube.com includes helpful support videos for
setting up and using UA products.

UA YouTube Support Channel

Universal Audio Community Forums

The unofficial UA discussion forums are a valuable resource for all Universal Audio
product users. This website is independently owned and operated.

www.uadforum.com

Contact Universal Audio Support

To contact UA support staff for technical or repair assistance, please visit:

help.uaudio.com

Universal Audio Technical Support48

www.uaudio.com