Hear Tech Hear Back PRO Four Pack, AES/EBU Input

(4) PRO Mixers, (1) PRO Hub Frame, (1) AES/EBU card, (1) Network card, (1) Tote Back, and (4) 50 Cat6 Cables



12-Month Special Financing**


Now with V6 Firmware

Assign each knob of a PRO Mixer to any mono channel, stereo pair of channels, or even a submix of up to 16 channels with the V6 update. Configure each Mixer differently and add up to 128 input channels to the system using additional Input Cards and Hubs (32 channels of inputs per Hub).

New V6 Features

  • PRO Digital Overlay compatibility
  • Allows 32 channel digital input cards (e.g. Dante, Waves, MADI)
  • Route-Assign-Submix up to 128 channels
  • Submix up to 16 stereo channels on each of the 16 knobs per Mixer
  • Up to 64 pairs of stereo-linked channels
  • Up to 32 input channels per Hub

Key Features

  • Panning width and stereo placement
  • Solo in place
  • Multiple Intercom
  • Preset copy and paste from one Mixer to another
  • Signal present indication on all channels
  • Mirroring function synchronizes all settings between multiple Mixers
  • iOS/macOS App available for ease of use
  • Remote control of all settings via iOS/macOS App or from another Mixer

Hear Back PRO System

This is it – the most comprehensive digital solution to get everyone the mix they need to perform their best. This new system platform is completely modular and infinitely expandable, which means it is the last personal monitoring system you’ll ever need.

Whether or not you’ve ever used a personal monitor mixer, the simple layout of this powerful system makes getting the right mix a quick and effortless experience. Based in Gigabit Ethernet, this framework paves the way for an impressive range of future possibilities.

The Hear Back PRO system consists of two main components: the Hub and the Mixer. The modular Hub consists of four card slots, which can be populated with any configuration of input and/or output cards to fit your exact needs. Each Hub has the ability to supply signal and power to as many as 32 Mixers (8 per Network Card), each over a single standard CAT6* cable. With the built-in HBUS In/ Out ports, multiple Hubs can be daisy-chained together, allowing for truly unlimited system expansion.

System Standouts

  • Modular I/O Hub card system allows for system customization
    • FW V5 and V6 allow two independent input sources simultaneously (e.g. Analog, Dante)
  • Large master knob controls overall main mix, AUX, and intercom levels independently
  • Volume and panning control of all channels
  • Direct and immediate visual feedback of all channels
    • Write session info and channel settings on storable Mixer overlays for an unlimited number of presets
    • Optional PRO Digital Overlay (available for FW V6) features OLED graphical displays for electronic channel labeling and Mixer status
    • Instantly store and recall presets from memory with the push of a button
    • Most recent configuration is saved, even after power-down
  • Support for sampling rates up to 192 kHz
  • Selectable XLR or 1/8″ Mixer AUX input on PRO Mixer
  • Built-in intercom broadcasts the AUX source (mic, MP3 player, click, etc.)
  • Intercom auto adjusts its own level so even the quietest message never goes unheard
  • Supports secondary power supply providing redundancy and power for up to 32 Mixers per Hub
  • USB port on Hub makes updating firmware for future features and upgrades a simple drag-and-drop operation
  • HBUS In/Out connections allow daisy-chaining Hubs and a wireless access point connection for use with the PRO’s iOS App
  • Side-mounted card slot on Mixer for future expansion
  • Status indicating logos on Hub and Mixers make it easy to detect and diagnose problems, should they arise
  • Hear Back PRO iOS App allows for complete control of all Mixers connected to the network

The Hear Back PRO system is available in a Four Pack plus an Overlay Upgrade, as well as offering Mixers and Hubs separately.


  • Hear Back PRO Four Pack, AES/EBU Input
    • (4) PRO Mixers, (1) PRO Hub Frame, (1) AES/EBU card, (1) Network card, (1) Tote Back, and (4) 50’ Cat6 Cables

Hear Back PRO Mixer Features

  • FIRMWARE V6 or later:
    • PRO Digital Overlay compatibility
    • Local control of up to 138 channels of audio (128 channels + Stereo AUX IN + up to 4 stereo intercom inputs)
    • Submix up to 16 stereo channels on each of the 16 knobs
  • FIRMWARE V1 and V2:
    • Local control of up to 18 channels of audio (16 mono channels + AUX IN + Intercom IN)
  • Volume/panning/stereo link control of all audio channels
  • Remote control all settings from iOS App or another Mixer
  • Receive power and audio over one Ethernet cable, up to 500′ from Hub to each Mixer
  • 24-bit Delta-Sigma D/A and A/D converters
  • Store up to 4 recallable presets
  • Intercom allows communication to anyone with a Hear Back PRO Mixer (up to 4 people at a time)
  • 1/8′ and 1/4′ headphone outputs with 2.2 Watts of power per channel
  • Balanced mono/stereo, line level outputs
  • Selectable 1/8″ TRS stereo unbalanced and XLR mono balanced (with 15V phantom power) AUX inputs:
    • Microphone input for crowd / ambiance mic or intercom use
    • Drum module / metronome or local mix input
  • Built-in 5/8″ threaded socket to mount Mixer to any standard mic or desk stand

Hear Back PRO Hub Features

  • FIRMWARE V6 or later:
    • Allows 32 channel digital input cards (e.g. Dante, Waves, MADI)
    • Up to 32 input channels per Hub
    • Multiple Hubs daisy-chain for up to 128 input channels
    • Mix and match input types (ex. Dante and Analog)
  • FIRMWARE V1 and V2:
    • Three switch selectable 16-channel input sources:
      • Input A (Slots 1 & 2)
      • Input B (Slots 3 & 4)
      • HBus
  • Six user-selectable sample rates indicated by LEDs: 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz and 192kHz
    • Note: Sample rates vary with interface cards:
      • Analog, Dante and AES/EBU – goes up to 192kHz
      • ADAT – goes up to 48kHz (SMUX not supported; ex. ADAT will down sample from 192kHz to 48kHz)
      • Waves – goes up to 96kHz
  • Less than .25 milliseconds total system delay (latency) from analog input to output
  • 16 RGB LEDs intuitively display signal/peak levels for channel metering
  • Standard CAT5e/6 cabling delivers power and signals to Mixers
  • Daisy-chain via HBus for very large systems
  • 1 RU chassis
  • Modular I/O card-slot configurable mainframe
  • Gigabit Ethernet network fabric
  • 48V Power Over Ethernet supply
Mixer Aux Input
Line Input Configuration/Impedance: 1/8″ Stereo, unbalanced, 10K ohms typical
Line Input Level: 0 dBu optimal, +18 dBu max
Mic Input Configuration/Impedance: XLR Mono, balanced, 150 ohms typical, 150 Hz high pass
Mic Input Level: -42 dBu optimal, -30 dBu max
Mixer Headphone Power
Load Impedance: THD less than 0.01%* THD less than 0.1%
8 Ohms: 1.2 W* 1.5 W
*THD AT 8 Ohms = 0.015% typical
16 Ohms: 1.6 W 1.8 W
25 Ohms: 2.0 W 2.2 W
32 Ohms: 1.8 W 2.0 W
50 Ohms: 1.5 W 1.6 W
100 Ohms: 1.1 W 1.2 W
200 Ohms: 500 mW 650 mW
600 Ohms: 220 mW 250 mW
IMD: Typically Less than 0.03%
Mixer Line Output
Freq Response: 20 Hz to 20 KHz, +/-0.15 dB
THD+N: 0.004% typical at 1 kHz, +15 dBu
0.008% typical, 20 Hz – 20 kHz, +4 dBu
IMD: 0.02% typical at +4 dBu, 60 Hz / 7 kHz
Crosstalk: Less than -93 dB @ 1 kHz
Propagation Delay:
– Analog Input to Analog Output: 0.248 mSec @ 192 kHz sample rate
– Digital Input to Analog Output: 0.092 mSec @ 192 kHz sample rate
– Digital Input to Digital Output: 0.0452 mSec @ 192 kHz sample rate
– Audio over Ethernet Protocol (HBUS): 0.000592 mSec
System Noise Performance
Noise, A-Weighted: -93 dBu @ 192 kHz sample rate
Dynamic Range: 117 dB typical
System I/O
Hub Line In, Analog: 8 balanced inputs on a DB-25 female (DA-88 pinout) per Analog Card
Hub Maximum Input Level, Analog: +8 dBu with analog card pad jumpers populated, +18 dBu with jumpers removed (up to +38dBu upon special request)
Hub HBus In, Out: 8-pin RJ45 jack (standard Ethernet pinout)
Hub USB Port: USB 2.0 (for firmware updates and editing configuration settings)
Hub Card Slots (4x): Each slot can accept an analog or digital input card, output card, or 8 port Mixer network card
Mixer to Hub Connection: 8-pin RJ45 jack (8x Mixer connections per network card)
Mixer Headphone Out: 1x TRS 1/4″ and 1x TRS 1/8″ unbalanced stereo
Mixer Line Out: 2x TRS 1/4″ balanced (left/mono and right)
Mixer Max Output Level, Analog: +24 dBu (mixed output)
Mixer Aux Input: 1x TRS 1/8″ unbalanced stereo and 1x XLR balanced mono (with 15 volts phantom power)
Mixer Card Slot: For future digital or analog input/output expansion capabilities or side-car add-on
Physical, Mixer
Size: 9.5″ (241 mm) H x 5.95″ (152 mm) W x 2.71″ (68.8 mm) D
Unit Weight: 1.6 lb. (0.72 kg)
Mounting: Standard mic stand (5/8″ 27 threads per inch) or desk mounted
Physical, Hub
Size: 1.75″ (44.5 mm) H x 19″ (483 mm) W x 8.5″ (216 mm) D
Unit Weight: 6.3 lb. (2.8 kg)
Mounting: Standard rack mount, 1 RU
Hub Power Requirements: 48VDC, 150 Watts (each external power supply powers up to 16 Mixers)**
Mixer Power Requirements: Power over Ethernet (PoE) 36-52 volts DC, 15 Watts max provided by Hub through Cat5e/6 network cabling
External Power Supply Requirements: Input Voltage: 90VAC to 264VAC 50/60 Hz

Cabling, Mixers and HBUS

CAT6*** cables used for Mixers or for HBUS can be run up to 500 feet in ideal conditions (one piece of solid conductor CAT6 with no breaks or couplings). The more breaks/connections/couplings in a cable run, the more limited this distance will be. Poor quality cabling will also limit the maximum distance.

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

**Hub is capable of powering up to 32 Mixers with an additional power supply.

***Cable complying with the National authorities (cable with an outer jacket or sleeving rated VW-1 or better).

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