Allen & Heath GR4 Rack Mount Zone Mixer

SKU: E-1-1220

Allen & Heath



The GR4 from Allen & Heath is a single rackmount or desktop audio mixer that provides comprehensive control of paging and background music in restaurants, bars, stores, and other retail/leisure environments. The mixer features four mic inputs on the rear panel via Phoenix connectors with an option to select Mic 1 from an XLR input on the front panel. Additionally, there are four pairs of stereo RCA connectors for audio playback devices. The two zone outputs are offered in stereo on Phoenix connectors, but may be changed to mono via internal jumpers. An additional two mono zone outputs (3 & 4) are available with mix output being selectable from internal jumpers. The optional PL-14 remote control provides a rotary volume control with four selectable source switches and connects via standard Cat5e cabling. The GR4 ships with a power cord, blanking bung covers, a set of rack ears, four countersunk Pozi screws, and 14 Phoenix connectors.

PHP 40,400.00

This product is currently out of stock.


MIXING: Individual mix and selectable control of all inputs to Z1 & Z2. Multiple options for configuring mix outputs to Z3 & Z4 (via internal jumpers).
DYNAMICS: Gain and 2 band EQ available on all mic inputs with an additional 2 band EQ available on Z1 & Z2 outputs.
PRIMARY MIC MODE: When audio sensed on MIC1 channel and/or PAGE contact closure is sensed then music is faded to pre-set level and MICs2-4 muted for the duration of the announcement. MIC1 zone select

LEDs flash slowly when in priority mic mode.
Gain / volume rotary controls can be removed and capped (caps supplied) to prevent unauthorised use.


Primary and secondary mic modes
Perfect for controlling hierarchal microphone feeds such as simple paging announcements.
Emergency mic mode : For use with 3rd party systems in emergency situations. Mutes all inputs except MIC1 on alarm contact closure.
Juke box mode : Provides a priority line input to the system for pre-recorded announcements or programme material such as Sports channels.

ADVANCED FEATURES - Entering programming mode allows the following parameters to be adjusted:

Ducker attenuation
Ducker hold time
Ducker release time
Music crossfade time
Jukebox hold time
Jukebox release time


  • Mic Input Sensitivity (Gain = Min): 0dBu
  • Mic Input Sensitivity (Gain = Max): -50dBu
  • Mic Level control (Max): +5dB
  • Mic Level control (Min): 80dB
  • Mic HPF -3dB: 320Hz (TBC)
  • Mic EQ LF: +/- 15dB fc = 80Hz
  • Mic EQ HF: +/-15dB fc = 8kHz
  • Mic Frequency Response: 20Hz – 20kHz +/-1Db
  • Mic THD+n @0dBu in 1kHz: 0.004% 22-22kHz
  • Mic THD+n @-30dBu in 30dB gain 1kHz: 0.005% 22-22kHz
  • Mic Hi Level warning LED (Unity gain): +18dBu
  • Clip level (Unity gain): +21dBu
  • ST Input Sensitivity (Gain link OFF): 0dBu
  • ST Input Sensitivity (Gain Link ON): -10dBu
  • ST Level control (Max): +6Db
  • ST Level control (Min): -76dB
  • ST Frequency response: 20Hz20Hz – 20kHz +/-0.5dB
  • ST THD+n @-10dBu in 1kHz: 0.015% 22-22kHz
  • ST THD+n @0dBu in 1kHz: 0.035% 22-22kHz
  • Crosstalk from unselected channel: -75dB @ 1kHz
  • Main Zone Level control (Max): 0dB
  • Main Zone Level control (Min): -74dB
  • Main Zone Hi Lev LED (Unity gain): +18dBu
  • Main Zone EQ LF: +/-15dB fc = 80Hz
  • Main Zone EQ HF: +/-15dB fc 8kHz
  • Main Zone Clip level (Unity gain): +21dBu


  • ST Input to Main Zone output (Unity): -90dBu 22-22kHz
  • Mic Input routed at Min gain: -88dBu 22-22kHz
  • Mic Input routed at Max gain: -77dBu 22-22kHz (150R source)

Power consumption:

  • GR4 unit (no remote attached): 15W


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