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Allen & Heath GR05 1u Rack Mount 5 In 4 Out Zone Mixer

Product Code ALGR05/X
Manufacturer Allen & Heath

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GR05 is a 5-input, 4-output analogue zone mixer for sound installations requiring 2 mic and 3 stereo line to up to 4 mono or 2 stereo zones. Internal jumpers allow custom configuration protected for day-to-day operation by non-technical staff. Zone volume may be remotely controlled.

GR05_3Quarter_Main The GR05 has 2 microphone inputs and 3 stereo line inputs.

These can be assigned to 4 zone outputs configurable in mono or stereo pairs and controlled by front panel or remote level controls. GR05_Back_Main Ducking, EQ and muting can be configured.

Further inputs and outputs are possible using the expander system. GR05-ST version also available, with XLRs replaced by Euroblock (Phoenix) connectors.

Key Features

  • 2 mic inputs
  • 3 stereo inputs
  • 4 XLR outputs
  • Routing Matrix
  • Remote Control
  • Ducking
  • Expandable
  • Lock out system
  • Internal power supply



Output level control High performance VCA system Front panel or remote DC control, assignable mute
Ducking Internal triggered by Mic1 and/or Mic2 External triggered by opto-isolated remote input Selectable -10dB, -20dB, mute, fast, slow
Routing Assignable 9 x 4 x 2 crosspoint matrix OFF, DIRECT or VCA paths to each output
Signal meters 3-colour LED for each input and output Green = signal (–12dB), yellow = 0dB, red = peak (+15dB)
Mic1,2 equalisers LF ±12dB 70Hz shelf, H/MF ±14dB @ 300Hz to 6kHz
Output equalisers LF ±12dB 70Hz shelf, HF ±14dB 9kHz shelf


Mic/Line 1,2 Balanced XLR pin2 = hot 2kohm -58 to –22dBu
  Phantom power = +15V Pad 10kohm -28 to +8dBu
Stereo Line 3,4,5 Dual RCA phono 10kohm -10dBV or +4dBu
Expander In 1,2,3,4 Part of 25way D female 10kohm 0dBu
Remote DC 1,2,3,4 Part of 25way D female 0V = off, +10V.DC = max
Ext. duck DC Part of 25way D female opto-isolated switch to 0V
Backup DC Part of 25way D female min +/-12V, max +/-15V.DC 300mA per rail
Mains Power Input 3pin IEC male socket 47-63Hz 18VA max
  nternally wired for country mains AC voltage:
  100V, 115V (110-120V),   230V (220-240V)
  Fuse T630mAL 250V 20mm T315mAL 250V 20mm


Zone out 1,2,3,4 Impedance balanced XLR pin2 = hot <75ohm Trim adjustable –10dBV to +4dBu
Expander Out 1-4 Part of 25way D female as Zone 1,2,3,4 out
Remote DC ref Part of 25way D female +10V.DC 5mA max


Maximum output +20dBu into 2kohm
Internal headroom +20dB
Frequency response 20Hz to 50kHz +0/-1dB
Distortion < 0.005% THD+noise at +12dBu 1kHz
Crosstalk Better than 90dB shutoff, 80dB interchannel
Noise Mic EIN -128dB referred to 150ohm source Line preamp -91dBu Mix noise all routed < -86dB


Width 483mm (19") Height 44/49mm (1.75") 1U Depth 260mm (10.3")
Weight Unpacked 4kg (9lb) Packed 5kg (11lb)

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