GR4 User Guide
22
AP10223 Issue_2
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
<0.2V
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
Unboxed Boxed
Height
48mm (1.9”) 200mm(7.9”)
Length
242mm (9.5”) 340mm(13.4”)
Width
438mm (17.2”) 530mm(20.9”)
Weight
3.4kg (7.5lbs) 4kg (8.8lbs)
