Hear Technologies HEAR-BACK-FOUR-PACK

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.

Features:

• 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

Specifications:

• 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%
          * 8 ohms: 150 mW (THD at 8 ohms=0.015% typical)
          * 16 ohms: 235 mW
          * 25 ohms: 675 mW
          * 32 ohms: 950 mW
          * 50 ohms: 1.6 W
          * 100 ohms: 1.14 W
          * 200 ohms: 500 mW
          * 600 ohms: 215 mW
        * THD less than 0.1%
          * 8 ohms: 230 mW
          * 16 ohms: 500 mW
          * 25 ohms: 775 mW
          * 32 ohms: 1.1 W
          * 50 ohms: 1.8 W
          * 100 ohms: 1.25 W
          * 200 ohms: 650 mW
          * 600 ohms: 220 mW
        * IMD: Typically less than 0.03%
• Line Out
      * Frequency 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' 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)
      * Mixer Headphone Out: TRS 1/4" unbalanced stereo (2 each)
      * Mixer Line Out: TRS 1/4" balanced (2 each)
      * Maximum Output Level, Analog: +24 dBu (mixed output)
      * Aux Input: TRS 1/8" unbalanced stereo
• Mixer Dimensions
      * Size: 11.5" H x 5.2" W x 3.6" D
      * Unit Weight: 1.2 lbs (0.54 kg)
      * Mounting: Standard mic stand or desk mount
• Hub Dimensions
      * Size: 1.75" H x 19" W x 7.125" D
      * Unit Weight: 5.0 lbs
• Mounting: Standard Rack Mount, 1 RU