Biamp AUTOONE User Manual

autoONE

Automatic Mixer

Operation Manual

Biamp Systems, 10074 S.W. Arctic Drive, Beaverton, Oregon 97005 U.S.A. [phone] www.biamp.com

blank

16Feb07

TABLE OF CONTENTS

Front Panel

Rear Panel

Logic Outputs

Specifications

Block Diagram

Warranty

autoONE

pgs. 4 & 5

INTRODUCTION

pg. 2

pg. 3

pg. 6

pg. 7

The autoONE Automatic Mixer is affordable, extremely versatile, and easy to
use. Features include NOM attenuation, adaptive threshold sensing, speech­frequency filtering, manual priority override, selectable channel-off attenuation,
and selectable last mic hold. The autoONE is covered by a five-year warranty.

autoONE features include:

♦ eight balanced mic/line inputs on plug-in barrier connectors

♦ trim, pad, level, & combined active/peak indicator per channel

♦ channel 1 manual ‘override’ via external contact-closure

♦ channel 8 ‘mix-minus’ assign & ‘ducking’ via channels 1~7

♦ balanced main & aux outputs on plug-in barrier connectors

♦ selectable last mic on, hpf, automix, & 24V phantom power

♦ selectable automix channel-off attenuation (-12dB or -40dB)

♦ pre/post automix assignment to main, aux, & patch outputs

♦ options selectable via external switches (no internal jumpers)

♦ logic outputs from channels for switching of external circuits

♦ Adaptive Threshold Sensing minimizes false gate triggering

♦ Speech-Frequency Filter minimizes false gating due to noise

♦ 6dB of hysteresis reduces gate ‘flutter’ when near threshold

♦ ‘stacking’ of two units to expand system input capability

♦ incorporates AES recommended grounding practices

♦

marked and UL / C-UL listed power source

♦ covered by Biamp Systems' five-year warranty

1

FRONT PANEL

trim

active active active active active active

trim trim trim trim trim trim trim

1 2 34 5 6 7 8

Active Indicator (Channels 1~8): These dual-color LEDs provide
indication of two channel functions: channel active & peak level.
When a channel is assigned for automixing (gated) operation, the
Active indicator will light green
(on). NOTE: The Active indicator does not

whenever the channel is active

light green on a
channel assigned for manual (ungated) operation. See Channel
DIP Switches on next page. The Active indicator will also light red

whenever channel signal levels reach +10dB (8dB below clipping).
Use this feature to aid in adjusting the Trim controls (see below).

Trim (Channels 1~8): These controls adjust the channel gain
(0~60dB) to compensate for different input signal levels. For best
performance, adjust these controls so the channel Active indictors
flash red

(+10dB) on occasional peaks. NOTE: Accurate Trim

control settings are essential prior to Threshold adjustment (see
Threshold below). Once Threshold has been set, individual
channel sensitivities may be fine-tuned using the Trim controls. If

input signals exceed normal operating range of the Trim controls,
assign the Pad switch (see DIP switches on next page).

Level (Channels 1~8): These controls adjust the amount of signal
sent from the individual input channels to the mixer output section.
Optimum Level setting is near the 12 o'clock position (unity gain).

Threshold: This control adjusts the minimum signal level
(threshold) at which channels will become active (gate on). The
Threshold circuit also has 6dB of hysteresis, which allows a
channel to stay open until the signal level drops below the
threshold by 6dB. This hysteresis reduces the tendency for a
channel to ‘flutter’ on & off when it detects a signal that is right at
the threshold level. Because of the hysteresis, different threshold
settings will be arrived at depending on how you adjust this control.
If Threshold is set fully clockwise, then turned counter-clockwise
until all channels are easily activated by normal signal levels, the
threshold will be as high above ambient noise as possible. If
Threshold is set counter-clockwise, then turned clockwise until no
channels are activated by ambient noise, the threshold will allow
for greatest channel sensitivity. The threshold is further controlled
by Adaptive Threshold Sensing (ATS). ATS monitors signal from
active channels and automatically adjusts the threshold to prevent
false activation of other channels. NOTE: Accurate Trim control

settings are essential prior to Threshold adjustment. Once
Threshold has been set, individual channel sensitivities may be
fine-tuned using the Trim controls.

active

active

master

aux

-20 on

threshold

release

Release: This control adjusts the length of time that any channel
remains active (on) after signal level has dropped below threshold.
Release Time is adjustable from 150 milliseconds to 4 seconds.
Since channels activate very quickly (4 milliseconds Attack Time),
precise adjustment of Release Time may not be critical. However,
when using Logic Outputs to control external switching circuits
(such as cameras), moderate Release Time settings may provide
more appropriate timing (see Logic Outputs on next page).

Master: This control adjusts the level of overall signal sent to the
Main Output. The Main Output level is also affected by automatic
NOM attenuation, which reduces the output level by 3dB for each
doubling of active (gated) channels. Optimum Master settings are
near the 12 o’clock position (unity gain) or below.

Aux: This control adjusts the level of overall signal sent to the Aux
Output. The Aux Output may be assigned either ungated (pre) or
gated (post) signals from the channels (see Master DIP Switches
on next page). NOTE: Unlike the Main Output, The Aux Output

does not

provide automatic NOM attenuation.

-20 Indicator: This dual-color LED provides indication of both
signal present & peak level at the Main Output. This indicator will
light green when (internal) signal levels reach -20dB (signal
present). This same indicator will light red

when (internal) signal
levels reach +10dB (8dB below clipping). Use this feature to aid in
adjusting the Master control. For best performance, adjust the
Master control so the -20 indictor flashes red

(+10dB) only on

occasional peaks in signal level.

On Indicator: When the Power Cord is plugged in, and power is
applied to the autoONE, the red On indicator remains lit.

autoONE

2

REAR PANEL

BIAMP SYSTEMS

27V

~

50/60 Hz

15 watts

class 2 wiring

Portland, Oregon

an affiliate of

Rauland-Borg Corp.

logic

outputs

expansion

main aux

outputs

stack in

AC Power Cord: The power transformer provides 27 Volts AC to
the mixer, and is detachable via a 5-pin DIN connector. The mixer
has two internal ‘self-resetting’ fuses (there are no user
serviceable parts inside the unit). If the internal fuses blow, they
will attempt to re-set after a short period. However, this may be an
indication that the mixer requires service.

Logic Outputs: This 9-pin Sub-D (male) connector provides logic
outputs from the eight channels, plus a common ground. When a
channel becomes active, the associated logic output turns on.
Logic Outputs are used to control external circuits for switching
speakers, cameras, or indicators (see Logic Outputs on pg. 4).

Expansion: This 6-pin Modular jack is for connection of a second
autoONE mixer to add system inputs. When using two autoONE
mixers in a system, it is necessary for the mixers to share
information regarding active channels. This information allows the
mixers to properly perform NOM Attenuation & Adaptive Threshold
Sensing. This connection requires a single Modular cable
(provided). The information shared is processed primarily by the
‘master’ autoONE. To prevent system errors, the second
autoONE mixer should be assigned as ‘slave’ (see Master DIP
Switches below). Channel 1 override

can be achieved by shorting

pins 3 & 6 (see Logic Outputs on pg. 4).

Main Output: These plug-in barrier strip terminals provide the
balanced line-level Main Output from the mixer. For balanced
connection, wire high (+), low (-), and ground (
connection, wire high (+) and ground (

d

), leaving (-) unconnected.
Signal level will be reduced by 6dB when output is unbalanced.
Main Output level is affected by the front panel Master control, as
well as by automatic NOM Attenuation, which reduces the output
level by 3dB for each doubling of active (gated) channels.

Aux Output: These plug-in barrier strip terminals provide the
balanced line-level Aux Output from the mixer. For balanced
connection, wire high (+), low (-), and ground (
connection, wire high (+) and ground (

d

), leaving (-) unconnected.
Signal level will be reduced by 6dB when output is unbalanced.
Aux Output level is affected by the front panel Aux control, but not
by automatic NOM Attenuation.

Stack In: These plug-in barrier strip terminals provide a balanced
line-level Stack In to the mixer. Signal entering here is combined
with signals from the input channels, and is then sent to the Main
Output section. When using multiple autoONE mixers within a
system, connect Main Output of one mixer to Stack In of the next
mixer, and so forth. All mixers except the final autoONE should be
assigned as ‘slaves’ (see Master DIP Switches below). For
balanced connection, wire high (+), low (-), and ground (
unbalanced connection, wire high (+) and ground to both (

patch

main patch

ON

slave

-12db
hp filter

last mic

d

). For unbalanced

d

). For unbalanced

aux post

input

pad

aux off

ungated

phantom

8

patch pre

d

d

) & (-).

patch

pad

ungated

phantom

). For

duck ch8

patch pre

input

patch

pad

ungated

phantom

7

duck ch8

patch pre

input

patch

pad

ungated

phantom

6

duck ch8

patch pre

input

patch

pad

ungated

phantom

5

duck ch8

patch pre

input

patch

pad

ungated

phantom

4

duck ch8

patch pre

input

patch

pad

ungated

phantom

3

duck ch8

patch pre

input

patch

ONONONONONONONON

pad

ungated

2

Main Patch: This 3-conductor TRS ¼” phone insert jack is for
connection of certain BIAMP products or other external devices at
the Main Output section. The Main Patch jack is pre-Master Level,
and is wired Tip (send), Ring (return), and Sleeve (ground).
Certain BIAMP products require a single TRS ¼” phone cable for
connection. Other devices may require a special ‘Y’ cable. If a
pre-Master Level output is desired, connect to Main Patch with Tip
& Ring (send) and Sleeve (ground).

Patch (Channels 1~8): These 3-conductor TRS ¼” phone insert
jacks are for connection of certain BIAMP products or other
external devices to the individual input channels. Patch jacks are
pre-Channel Level, and are wired Tip (send), Ring (return), and
Sleeve (ground). Certain BIAMP products require TRS ¼” phone
cables for connection. Other devices may require special ‘Y’
cables. If a pre-Channel Level direct output is desired, connect to
Patch with Tip & Ring (send) and Sleeve (ground). Patch jacks
may be individually assigned pre-gate or post-gate signal (see DIP
Switches below).

Input (Channels 1~8): These plug-in barrier strip terminals
provide the balanced mic/line Inputs to the mixer. For balanced
connection, wire high (+), low (-), and ground (
connection, wire high (+) and ground to both (

d

). For unbalanced

d

) & (-). Phantom

power (+24VDC) is available (see DIP Switches below).

Master DIP Switches: These switches assign functions to the
mixer as a whole (when pushed up). Slave
an expander to a ‘master’ mixer. -12dB
attenuation (instead of -40dB). HP Filter
of 6dB/octave @ 170Hz. Last Mic
channel to remain on. Aux Post

causes the most recently active

assigns post-gate/level channel

assigns the mixer as

selects -12dB channel-off

assigns a high-pass filter

signals to the Aux Output (instead of pre-gate/level signals).

DIP Switches (Channels 1~8): These switches assign functions
to the individual channels (when pushed up). Pad
signal -18dB (line input). Ungated
Phantom
Duck Ch 8

-12dB attenuation on Channel 8 (ducking). Aux Off

turns on +24V phantom power (for condenser mics).

(Channels 1~7 only) assigns channel signal to activate

turns channel on (defeats gate).

attenuates input

(Channel 8
only) removes Channel 8 signal from Aux Output (mix-minus).
Patch Pre

assigns pre-gate channel signal to channel Patch jack

(instead of post-gate channel signal).

phantom

duck ch8

patch pre

input

1

3

LOGIC OUTPUTS

The autoONE provides eight logic outputs on a rear panel 9-pin Subminiature D (male) connector. Logic Outputs can be used to control
external switching circuits for speakers, cameras, indicators, etc. The autoONE Logic Outputs are most often used, in conjunction with
external relays, to turn off specific speakers when nearby microphones are active (reducing feedback problems). For example, if a speaker
is located directly above microphone #1, the Logic Output for Channel 1 of the autoONE can be used to turn off that speaker relay when
microphone #1 is active (see diagram on next page). The Logic Outputs can also be combined (wired in parallel) to control a single circuit.
For example, a speaker relay could be turned off when either microphone #1 or microphone #2 is active. In addition to speaker relays, the
autoONE Logic Outputs may be used to control external indicator lights (see diagram on next page). Another common application for
Logic Outputs is to control video cameras. Different cameras could be activated depending upon which microphone (or group of
microphones) is currently active. Cameras can be selected using a video switcher and/or ‘pan/tilt/zoom’ camera presets. The Logic
Outputs may also be used in conjunction with the Expansion jack (pin 6 & pin 3) to perform ‘automatic priority’, which allows all other
channels to be muted whenever the Channel 1 microphone is active (see diagram on next page). The Logic Output (pin 1) & ground (pin

9) terminals for the Channel 1 ‘priority’ microphone are wired to pin 6 & pin 3 respectively of the Expansion jack. A switch or contact­closure may instead be used, for manual priority override.

The autoONE Logic Outputs are ‘open collector’ outputs. Each Logic Output is an NPN transistor with the collector being the output and
the emitter being ground (see diagram on next page). When a Logic Output is turned on, the transistor provides a path for DC current to
flow. The Logic Outputs do not provide any voltage or current. They act only as switches (with a common ground return). To activate
external relays, an external power supply must be used (see diagram on next page). The Logic Output transistors are rated up to a
maximum of 24 VDC and 50 mA per output (24 volt relay coils maximum). However, +12 Volts DC is sufficient power for most
applications. When using the Logic Outputs to control relays, protection diodes must be used to suppress high voltage transients that are
generated when the relays turn off (see diagram on next page). Any of the 1N4004 family of diodes (1N4001, 1N4002, 1N4003, 1N4004,
1N4005, 1N4006, 1N4007, or equivalent) will provide proper protection. When a Logic Output goes on, the associated relay may be wired
to perform on, off, or ’A/B’ switching functions. To use logic ‘on’ to turn on (or activate) a device, wire across the ‘normally open’ relay
contacts, in series with the device (or control voltage source). To use logic ‘on’ to select between ‘A’ or ‘B’ signals (inputs or outputs), wire
one signal to the ‘normally closed’ relay terminal and the other signal to the ‘normally open’ relay terminal, with the common relay terminal
providing the feed (input or output).

The 9-pin Sub-D connector used for the autoONE Logic Outputs is the same type of connector used for RS-232 communications ports on
IBM compatible computers. A cable may be created by simply wiring to the proper pins of a female 9-pin Sub-D cable-end connector.

logic out pin number

12345

6789

logic

outputs

channel 1
channel 2
channel 3
channel 4
channel 5
channel 6
channel 7
channel 8

ground

pin #1
pin #2
pin #3
pin #4
pin #5
pin #6
pin #7
pin #8
pin #9

5

4

3

2

9

1

8

7

6

9-pin cable-end

4

Logic Output #1

autoONE

Pin #1

LOGIC OUTPUTS

Logic/Relay circuit

+12 Volts DC

Power Supply

−+

12V Relay

Contacts

normally closed

common

normally open

autoONE +12 Volts DC

Logic Output #1

Pin #9

Logic Outputs controlling indicators

Power Supply

−+

Pin #1

1N4004

Diode

Coil

Indicator Panel

1.2k ohms

LED

Pin #9

Channel 1 ‘automatic’ (logic output) or ‘manual’ (external switch) override of Channels 2~8

63

1

logic

9

ground

expansion

external

switch

outputs

5

SPECIFICATIONS

Frequency Response (20Hz~20kHz @ +4dBu): +0/-0.5dB Maximum Output:

THD + Noise (20Hz~20kHz @ +4dBu): < 0.03% main & aux outputs +24dBu

Output Noise (20Hz~20kHz, main & 1 channel @ nominal): < -75dBu channel & main patch +18dBu

Maximum Gain: Maximum Input:

mic/line input to main/aux outputs 86dB mic/line input, channel & main patch +18dBu

channel patch to main/aux outputs 26dB main stack +24dBu

main patch to main output 16dB High-Pass Filter: 6dB/octave @ 170Hz

main stack to main output 10dB Automixing:

Crosstalk (channel-to-channel @ 1kHz): < -65dB gate attack time 4mSec

Output Impedance: release time (adjustable) 150mSec to 4Sec

main & aux outputs (balanced) 200 ohms threshold (adjustable) -32dBu to -8dBu

channel & main patch (unbalanced) 100 ohms channel-off attenuation (selectable) -12dB or -40dB

Input Impedance: NOM attenuation (doubling of active inputs) -3dB

mic/line input (balanced) 4.7k ohms Feedback/Noise Improvement (8 channels) 9dB

channel patch (unbalanced) 5.3k ohms Power Consumption (115/230VAC 50/60Hz): < 15 watts

main patch (unbalanced) 6.7k ohms Dimensions (HxWxD): 1.75”x19”x11” (44x483x279mm)

main stack (balanced)

28k ohms Weight: < 10 lbs. (4.55kg)

6

Input Channels

input

3
2
1

threshold

release

priority

slave bus

(Ch.1 only)

last mic hold

+24V

phantom

power

trim

discrete

transistor

preamp

gate control

logic

18dB

pad

gate
open

BLOCK DIAGRAM

autoONE Block Diagram

+10dB

peak

detect

ATS

count

bus

priority

bus

attenuator

(gate)

open collector

output driver

ungated

patch

pre-gate

-12/-40dB

attenuator

(gate)

logic output
(gate open)

channel
patch

-12dB
bus

aux pre

bus

channels 1-7

signal
detect

aux disable
(Ch.8 only)

only

aux post

bus

level

mute

bus

channel 8

only

12dB
mute

mute
logic

mix
bus

Master Section

main
stack

3
2

1

mix
bus

Expansion

main
patch

Σ

aux pre

bus

aux post

bus

priority

bus

ATS

threshold

release

time

Adaptive

Threshold

Sensing

threshold

release

priority

master
level

slave

pre/post

external control voltage

HP

filter

aux

count

bus

NOM

logic

last mic

hold

-20

VCA

aux

level

VCA control output

channel gate logic

peak

main

output

aux
output

3
2
1

3
2
1

7

WARRANTY

BIAMP SYSTEMS IS PLEASED TO EXTEND THE FOLLOWING 5-YEAR LIMITED WARRANTY TO THE

ORIGINAL PURCHASER OF THE PROFESSIONAL SOUND EQUIPMENT DESCRIBED IN THIS MANUAL

1. BIAMP Systems warrants to the original purchaser of new
products that the product will be free from defects in material
and workmanship for a period of 5 YEARS from the date of
purchase from an authorized BIAMP Systems dealer, subject to
the terms and conditions set forth below.

2. If you notify BIAMP during the warranty period that a BIAMP
Systems product fails to comply with the warranty, BIAMP
Systems will repair or replace, at BIAMP Systems' option, the
nonconforming product. As a condition to receiving the benefits
of this warranty, you must provide BIAMP Systems with
documentation that establishes that you were the original
purchaser of the products. Such evidence may consist of your
sales receipt from an authorized BIAMP Systems dealer.
Transportation and insurance charges to and from the BIAMP
Systems factory for warranty service shall be your responsibility.

3. This warranty will be VOID if the serial number has been
removed or defaced; or if the product has been altered,
subjected to damage, abuse or rental usage, repaired by any
person not authorized by BIAMP Systems to make repairs; or
installed in any manner that does not comply with BIAMP
Systems' recommendations.

4. Electro-mechanical fans, electrolytic capacitors, and normal
wear and tear of items such as paint, knobs, handles, and
covers are not covered under this warranty.

Biamp Systems

10074 S.W. Arctic Drive

Beaverton, Oregon 97005

[phone]

5. THIS WARRANTY IS IN LIEU OF ALL OTHER
WARRANTIES, EXPRESS OR IMPLIED. BIAMP SYSTEMS
DISCLAIMS ALL OTHER WARRANTIES, EXPRESS OR
IMPLIED, INCLUDING, BUT NOT LIMITED TO, IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE.

6. The remedies set forth herein shall be the purchaser's sole
and exclusive remedies with respect to any defective product.

7. No agent, employee, distributor or dealer of Biamp Systems
is authorized to modify this warranty or to make additional
warranties on behalf of Biamp Systems. statements,
representations or warranties made by any dealer do not
constitute warranties by Biamp Systems. Biamp Systems shall
not be responsible or liable for any statement, representation or
warranty made by any dealer or other person.

8. No action for breach of this warranty may be commenced
more than one year after the expiration of this warranty.

9. BIAMP SYSTEMS SHALL NOT BE LIABLE FOR SPECIAL,
INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES,
INCLUDING LOST PROFITS OR LOSS OF USE ARISING
OUT OF THE PURCHASE, SALE, OR USE OF THE
PRODUCTS, EVEN IF BIAMP SYSTEMS WAS ADVISED OF
THE POSSIBILITY OF SUCH DAMAGES.

585.0145.90A