The Allen & Heath GR4 Rack Mount Zone Mixer 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.

Connectivity

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

Optional Remote: Remote control can be achieved via the optional PL-14 Remote connected to the rear mounted RJ45 or custom/3rd party analogue remotes connected to the rear mounted Phoenix connectors

Features

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 MICSs 2-4 muted for the duration of the announcement. MIC1 zone select LEDs flash slowly when in priority mic mode

Installer Selectable Modes

Primary and Secondary Mic Modes: Perfect for controlling hierarchical 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 programed 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

Product Specifications:

Microphone Inputs:

Mic Input Sensitivity (Gain = Min):0 dBu

Mic Input Sensitivity (Gain = Max):-50 dBu

Mic Level control (Max):+5 dB

Mic Level control (Min):-80 dB

Mic HPF -3 dB:150 Hz

Mic EQ LF:15 dB fc = 80 Hz

Mic EQ HF:15 dB fc = 8 kHz

Mic Frequency Response 20 Hz 20 kHz:1 dB

Mic THD+n @ 0 dBu in 1 kHz:0.004% 22 Hz – 22 kHz

Mic THD+n @ -30 dBu in 30 dB gain 1 kHz:0.005% 22 Hz – 22 kHz

Mic Hi Level warning LED (Unity gain):+18 dBu

Clip level (Unity gain):+21 dBu

Stereo Inputs:

ST Input Sensitivity (Gain link OFF):0 dBu

ST Input Sensitivity (Gain Link ON):-10 dBu

ST Level control (Max):+6 dB

ST Level control (Min):-76 dB

ST Frequency response 20 Hz 20 kHz:0.5 dB

ST THD+n @ -10 dBu in 1 kHz:0.015% 22 Hz – 22 kHz

ST THD+n @ 0 dBu in 1 kHz:0.035% 22 Hz – 22 kHz

Crosstalk from Unselected Channel:-75 dB @ 1 kHz

Zone Output:

Main Zone Level Control (Max):0 dB

Main Zone Level Control (Min):-74 dB

Main Zone Hi Lev LED (Unity Gain):+18 dBu

Main Zone EQ LF: 15 dB fc =80 Hz

Main Zone EQ HF: 15 dB fc =8 kHz

Main Zone Clip Level (Unity gain):+21 dBu

Noise:

ST Input to Main Zone Output (Unity):-90 dBu 22 Hz – 22 kHz

Mic Input Routed at Min Gain as Well:-88 dBu 22 Hz – 22 kHz

Mic Input Routed at Max Gain:-77 dBu 22 Hz – 22 kHz (150R source)

Power:

100 – 240 VAC, 50/60 Hz, 20 W

Power Consumption:15 W (with no remote attached)

Weight:7.5 lbs. / 3.4 kg

Shipping Weight:11 lbs.

Shipping Dimensions:21 x 14 x 9″