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
Technical Info
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
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