Allen and Heath GR4 mixer

Connectivity options on the Allen & Heath GR4 include:

• Mic Inputs: Four mic inputs on rear mount Phoenix connectors with MIC1 selectable to an optional front mounted XLR.
• Line Inputs: Four stereo inputs on rear mount phono connectors. An additional front mounted 3.5mm jack socket overrides input 4 phono source.
• Zone Outputs: Two stereo (mono selectable via internal jumper) zones on rear mount Phoenix connectors. An additional two mono zone outputs are available with mix output being selectable from internal jumpers.
• Control: Paging and Alarm contact inputs on rear mounted Phoenix connectors allow integration with 3rd party paging stations and fire alarm systems.
• Remote: Remote control can be achieved via PL-14 Remote connected to the rear mounted RJ45 or custom/3rd party analogue remotes connected to the rear mounted Phoenix connectors.

Includes

• 1 x GR4 Zone Mixer
• 1 x User Guide (AP10223).
• 1 x ROHS Addendum Notes (AP7014).
• 1 x Safety Instructions (AP9240/CL1-1)
• 1 x Mains Cable (IEC C13 to local mains connector)
• 19 x Blanking Bung
• 1 x Set of Rack ears
• 4 x M3 X 6mm Countersunk Pozi screws
• 2 x Header Plug Euroblock 2-Pole
• 2 x Header Plug Euroblock 4-Pole
• 10 x Header Plug Euroblock 3-Pole

Features

• 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.
• Secondary mic mode: When audio is sensed on MIC2, 3 or 4 then music is faded to pre-set level for the duration of the announcement. MICS 2-4 zone select LEDs flash slowly when in secondary mic mode.
• Emergency mic mode: When alarm contact is activated all zone feeds are muted and Mic1 is fed direct to all zones. All select LEDs except mic1 LED are switched off for the duration. Mic1 LED will flash quickly.
• Juke box mode: When music sensed on ST3, fade down current music feed and fade up ST3. When ST3 silent for pre-set period, fade down ST3 and resume previous music feed. Mic volume not affected.
• Music fade: Option to select next music feed and then unit will fade between sources after short delay.
• Zone lock: Allows select buttons to be disabled for a particular zone. LED corresponding to the button locked will be turned off.

Specifications

• Microphone Inputs:
  • Mic Input Sensitivity (Gain = Min): 0dBu
  • Mic Input Sensitivity (Gain = Max): -50dBu
  • Mic Level control (Max): +6dB
  • Mic Level control (Min): OFF
  • Mic HPF -3dB: 150Hz
  • Mic EQ LF: +/- 15dB fc = 60Hz
  • Mic EQ HF: +/-15dB fc = 9kHz
  • 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
  • Mic EIN@50dB Gain: -127dB
• Stereo Inputs:
  • ST Input Sensitivity (Gain link OFF): 0dBu
  • ST Input Sensitivity (Gain Link ON): -10dBu
  • ST Level control (Max): +6dB
  • ST Level control (Min): OFF
  • Max Line Input: +18dBu
  • ST Frequency response 20Hz – 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
• Zone Outputs:
  • Nominal Zone Level: 0dBu (-10dBu with optional jumper)
  • Main Zone Level control (Max): 0dB
  • Main Zone Level control (Min): OFF
  • Main Zone 3 Segment LED Meter: -18/+3/+17dBu
  • Main Zone EQ LF: +/-15dB fc = 60Hz
  • Main Zone EQ HF: +/-15dB fc = 9kHz
  • Main Zone Clip level (Unity gain): +21dBu
• Alarm/Page Inputs:
  • Max/Min Voltage: +15/-15V
  • Input source/sink: Max 5mA
  • Off Threshold:
  • On Threshold: >1V
• Noise:
  • 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
  • Loaded Power (Max): 20W
• Weights & Dimensions:
  • Weight: 7.5 lbs
  • H x L x W: 1.9 x 9.5 x 17.2 in.