Hear Technologies Hear Back Hub

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zZounds Gear Experts Say...
Add an additional Hub to your Hear Back headphone distribution amp system, and expand your studio's headphone monitoring capabilities with eight more mixes.

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.

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

Aux Input
Input Configuration/Impedance: Stereo, unbalanced, 10 Kohms typical
Input Level: +4 dBu optimal, +22 dBu max

Head Phone Power
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%

Line Out
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

Propagation Delay: Less than 1.5 mSec, Hub input to mixer output using 500 ft. of cable

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)

Maximum 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)

Physical, Hub
Size (HxWxD): 1.75 x 19 x 7.125 in.

Unit Weight: 5.0 lb.

Mounting: Standard rack mount, 1 RU

For support or warranty questions, please contact the manufacturer:
Phone: 256-922-1200
Product Sheet
User Guide

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