Hear Back System

Key Advantages

  • Virtually unlimited system size
  • Very attractive pricing
  • Excellent audio fidelity
  • Built-in DSP Limiter
  • Very long digital lines 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 ten channels of audio (8 inputs plus a stereo Aux input) Master Volume (controls the level to the headphones, line outs and the Aux input to the line outputs)
  • Built-in DSP Limiter (designed as a “brick wall” limiter for hearing protection and to protect monitor wedges from overload)
  • Headphone amplifier fault indicator in case of over temperature, or a short, the red LED comes on to alert the user something is a problem.
  • A second visual trouble shooting aid for the user is the Bus status indicator
  • Link Indicators – Whenever two pairs of mono inputs are linked for stereo operation the link LED is illuminated
  • Standard CAT5E power and signal Connection, cost effective, simple, non-obtrusive 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
  • Built-in Mic Stand Mount may be mounted to a standard mic stand or clipped onto a stand extension bar or clip
  • High Power – Low Distortion Headphone Amplifiers
  • One of the industry's most powerful headphone amplifiers
Placeholder image
Placeholder image
Placeholder image
Placeholder image
Placeholder image

Hear Back

A basic Hear Back 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. That’s one for you and everybody in the band. If that’s not enough, the Hubs can be daisy-chained using the HearBus In and Out for virtually unlimited system size. The Hear Back Hub can accept analog input signals from audio mixers, auxiliary, matrix, monitor, 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 the HearBus for transmission of up to 500 feet.

The Hear Back system is available in a Four Pack as well as offering Mixers and Hubs separately. The Hear Back Four Pack includes 4 Mixers, 1 Hub, 4 - 50 foot CAT5e cables, and a Hear Back analog DA-88 style cable.

System Features

Hear Back OCTO Mixer Features

The Hear Back Mixer is equipped to mount to any standard mic or desk stand using the built-in 5/8" threaded socket located on the back of the mixer.

  • Local control up to eight channels of audio
  • Master volume
  • Built-in DSP limiter
  • 24-bit D/A converters
  • Less than 1.5 millisecond total system delay
  • Bus status indicator
  • Headphone amplifier fault indicator
  • Link indicators
  • Standard CAT5E power and signal connection
  • Balanced line outs, mono/stereo
  • Stereo AUX in:
    • Expand numbers of mixers
    • Drum module/metronome input
  • Built-in standard threaded mic stand mount

Hear Back OCTO Hub Features

  • Three switch selectable 8-channel input sources:
    • ADAT® Optical
    • Analog
    • HearBus
  • 24-bit A/D converters
  • Digital inputs: 44.1KHz and 48 KHz sample rates
  • Less than 1.5 milliseconds system delay
  • 3-LED four-level metering
  • Standard CAT5E - delivers power and signals to mixers
  • Daisy-chain for very large systems
  • Internal universal input power supply
  • 1 RU chassis

Hear Back OCTO

Mixer Aux Input
Line Input Configuration / Impedance: Stereo, unbalanced, 10 Kohms typical
Line Input Level: +4 dBu optimal, +22 dBu max
Mixer Headphone Power (Per Channel)
Load Impedance: THD less than 0.01%* THD less than 0.1%
8 Ohms: 150 mW* 230 mW
*THD AT 8 Ohms = 0.015% typical
16 Ohms: 235 mW 500 mW
25 Ohms: 675 mW 775 mW
32 Ohms: 950 mW 1.1 W
50 Ohms: 1.6 W 1.8 W
100 Ohms: 1.14 W 1.25 W
200 Ohms: 500 mW 650 mW
600 Ohms: 215 mW 220 mW
IMD: Typically Less than 0.03%
Mixer Line Output
Freq Response: 20 Hz to 20 KHz, +0.04 dB, -0.55 dB
THD+N: 0.008% typical at 1 KHz, +15 dBu,
0.02% typical, 20 Hz – 20 KHz, +4 dBu
IMD: 0.02% typical at +4 dBu, 60 Hz/7 KHz
Crosstalk: Better than -85 dB @ 1 KHz
Latency: Less than 1.5 mSec, Hub input to mixer output using 500' of cable
System Noise Performance
Noise, A-Weighted: -91 dBu @ analog, -97 dBu optical
Dynamic Range: 112 dB typical
System I/O
Hub Line In, Analog: 8 Balanced inputs on DB-25 female (Tascam DA-88 pinout)
Hub Max Input Level, Analog: +15 dBu
Hub Light Pipe In: Industry standard fiber optic connector, shuttered
Hub HearBus In, Out: 8-pin RJ45 jack (2 each)
Mixer Headphone Out: TRS 1/4" unbalanced stereo (2 each)
Mixer Line Out: TRS 1/4" balanced (2 each)
Mixer Max Output Level, Analog: +24 dBu (mixed output)
Mixer Aux Input: TRS 1/8" unbalanced stereo
Physical, Mixer
Size: 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)
Unit Weight: 15.8 oz. (0.45 kg)
Mounting: Standard mic stand (5/8" 27 threads per inch) or desk mounted
Physical, Hub
Size: 11.5" (29.2 cm) H x 5.2" (13.2 cm) W x 3.6" (9.15 cm) D
Unit Weight: 5.0 lb.
Mounting: Standard rack mount, 1 RU

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


Hook-Up Diagrams

Application/Product Notes:



If you need help from our highly skilled Tech Support, the easiest and quickest way to get your solution is by phone. Hear Technologies is committed to providing you the industry's best customer service.

Max Sulkowski
Phone: 1-256-922-1200 ext. 135
Fax: 1-256-922-1221

For more information please see our Support page.

Follow Us

Facebook Logo
youtube logo