Hear Technologies Back OCTO Datasheet

The next evolution of the Hear Back 8-channel
personal monitoring system has arrived – introducing
Hear Back OCTO. With improved audio quality, system
performance, and overall ease of use, it revolutionizes monitor
mixing on stage or in the studio. Imagine getting your mix exactly the way you want it.
With the Hear Back OCTO, you save time and get the sound just right, the first time.
This affordable system is perfect for headphones, wired and wireless in-ear monitors,
and/or conventional floor monitors.

The Hear Back OCTO System: Hub & Mixers

A basic Hear Back OCTO system consists of a Hub and personal Mixers connected using
standard CAT5e cables. A single Hub supplies signal and power to a maximum of eight
Mixers. To expand your system, the Hubs can be daisy-chained using the HearBus In/Out
for virtually unlimited system size. The Hub accepts analog input signals from an audio
mixer such as auxiliaries, matrix outs, sub outs, monitor outs, and/or direct outputs. The
ADAT input can come from digital audio workstations, digital recorders, or digital mixers.

For front of house or remotely located digital mixers, we also have the Extreme Extender
ADAT In/Out that converts ADAT optical (which has very limited distance) to HearBus for
transmission of up to 500 feet.

NEW FEATURES

• Improved ease of use

• Enhanced sound quality

• Inspired by Hear Back PRO system

• More compact size

• Capacitive touch link buttons

• Easier labeling with flat-top surface

• 8 mono channels with up to 4 stereo pairs

• 100% backwards compatible with the
original Hear Back system

• Compatible with the Hear Back PRO
system via optional PRO Hub ADAT Card

• All connectors conveniently located on one
end for easy access

• Includes 1/8” and 1/4” headphone jacks

System Standouts:

• Virtually unlimited system size

• Affordable solution

• Excellent audio fidelity

• Very long digital cables possible without
loss of audio quality

• Audio inputs ADAT, analog, and the
HearBus are switch selectable from the
front panel

• Local control of up to 10 channels of audio
(eight inputs plus a stereo AUX input).
Master Volume controls the level of
headphones, line outs, and AUX input.

• Headphone amplifier fault indicator:
In case of overheating or a short, the red
LED illuminates to alert the user of a
problem

• Bus Status Indicator: Confirms proper
connection to the Hub

• Link Indicators: Whenever two pairs of
mono inputs are linked for stereo
operation, the link LED is illuminated

• Standard CAT5e power and signal
connection - a cost effective, simple,
unobtrusive way to connect eight
channels of audio. The cable is held in
place with a built-in cable strain relief.

• Balanced line-outs, mono/stereo

• Stereo AUX In

• Mixer has a built-in mic stand mount for
attaching to a standard mic stand or
clipping onto a stand extension bar or clip

• High power - low distortion headphone
amplifiers

Hub Features:

• Three switch selectable input sources:

®

– ADAT
– Analog
– HearBus

• 24-bit A/D converters

• 44.1KHz and 48KHz sample rates

• Multi-color, four-level metering

• Daisy-chain for expanded systems

• Internal universal input power supply

• 1 RU chassis

Optical

Mixer Features:

• Local control up to 10 channels of audio

• Master volume

• Built-in standard mic stand mount

• 24-bit D/A converters

• Bus status indicator

• Headphone amplifier fault indicator

• Mono/stereo link indicators

• Balanced line outs, mono/stereo

• Stereo AUX in:
– Expand numbers of mixers

– Drum module/metronome input

Designed, Engineered & Assembled

IN THE U.S.A.

The following are registered trademarks of Hear Technologies: Hear Technologies, Hear
Back, Extreme Extender, Hearbuds, HearBus, and the "Jack" logo. All names and marks of
other companies belong to those respective companies.

Technical Specifications

Mixer Aux Input

Line Input Configuration/Impedance:

Line Input Level:

Mixer Headphone Power (Per Channel)

Load Impedance:

8 Ohms:

16 Ohms:

25 Ohms:

32 Ohms:

50 Ohms:

100 Ohms:

200 Ohms:

600 Ohms:

Inter Modulation Distortion:

Mixer Line Output

Frequency Response:

THD+N:

Inter Modulation Distortion:

Crosstalk:

Latency:

System Noise Performance

Noise, A-Weighted:

Dynamic Range:

System I/O

Hub Line In, Analog:

Hub Max Input Level, Analog:

Hub Light Pipe In:

Hub HearBus In, Out:

Mixer Headphone Out:

Mixer Line Out:

Mixer Max Output Level, Analog:

Mixer Aux Input:

Physical, Mixer

Size:

Unit Weight:

Mounting:

Physical, Hub

Size:

Unit Weight:

Mounting:

Power

Hub Power Requirements:

Stereo, unbalanced, 10 Kohms typical

+4 dBu optimal, +22 dBu max

THD less than 0.01%*

342 mW

731 mW

1.07 W

1.37 W

1.26 W

971 mW

512 mW

185 mW

Typically less than 0.02%

20 Hz to 20 KHz, +/-0.16 dB

0.004% typical at 1 kHz, +18 dBu

0.008% typical, 20 Hz - 20 kHz, +4 dBu

0.02% typical at +4 dBu, 60 Hz / 7 kHz

Less than -85 dB @ 1 kHz

Less than 1.5 mSec

-94 dBu @ analog, -97 dBu optical

122 dB typical

8 Balanced inputs on DB-25 female (DA-88 pinout)

+18 dBu

Industry standard fiber optic connector, shuttered

2x 8-pin RJ45 jack

1x TRS 1/8" and 1x 1/4" unbalanced stereo

2x TRS 1/4" balanced (left/mono or stereo)

+28 dBu (mixed output)

TRS 1/8" unbalanced stereo

5.1" H x 9.3” W x 2.519" D
(12.95 cm H x 23.62 cm W x 6.40 cm D)

15.8 oz. (0.45 kg)

Standard mic stand (5/8" 27 threads per inch)
or desk mounted

1.75" H x 19.0" W x 5.0" D
(4.45 cm H x 48.26 cm W x 12.7 cm D)

3.9375 lb. (1.79 kg)

Standard rack mount, 1 RU

~100-240VAC 125W 50/60Hz

THD less than 0.1%

412 mW

783 mW

1.25 W

1.6 W

1.88 W

1.03 W

537 mW

190 mW

Hear Back OCTO | Mixer

Hear Back OCTO | Hub

FRONT PANEL

REAR PANEL

5 6 74 98

1 - Audio Input Channels 1-8 Level

LED Metering

2 - HearBus Clock Status Indicator
3 - Input Selector Switch

Example Hook-up

Daisy-Chain

Additional OCTO Hubs

BOTTOM

1

2

6 7 8 9 10 11

3

1 - Bi-Color Bus Status Indicator
2 - Link Indicators

(Channels 1/2, 3/4, 5/6, 7/8)

3 - Mono Channels 1-8 /

Stereo Link Master Level (1, 3, 5, 7)

4 - Headphone Amplifier Fault Indicator
5 - Master Volume

4

6 - Left/Mono Line Output

5

7 - Right Line Output
8 - 1/8” TRS Headphone Output
9 - 1/4” TRS Headphone Output
10 - Stereo Auxiliary Input
11 - RJ45 Connection

3

4 - AC Power Input
5 - ADAT Optical Input
6 - HearBus Input
7 - HearBus Output
8 - Hear Back OCTO Mixer Outputs
9 - Analog Inputs

Connect Additional

OCTO Mixers

Note: 0 dBu = 0.775 Vrms. Specifications and features subject to change without notice.

Hear Technologies® www.HearTechnologies.com

991 Discovery Drive Phone: [phone]
Huntsville, AL 35806 Fax: [phone]

ADAT Optical Input

OCTO Mixer for Each Musician

Analog Inputs

Printed in U.S.A. ©2017

Sep 2017