Allen&Heath GL4800 USER GUIDE - Manual (Page 11)

GL4800 User Guide 11
Specifications
Performance
0dBu = 0.775 Vrms Reference for high level equipment +4dBu = 1.23 V
0dBV = 1 Vrms Reference for low level equipment -10dBV = 310 Mv
0VU meter reading = +4dBu at XLR outputs
Input Gain
Mic/Line Input +6dB to +60dB variable
Mic/Line + Pad -14dB to +40dB variable
Line Input -14dB to +40dB variable
Stereo Line Input off to +10dB variable
2-track Return
off to +10dB variable
Maximum Output Level
Main Outputs +27dBu into load of >600 ohm
Jack Outputs +21dBu into load of >2K ohm
Internal headroom +21dB
Frequency Response
Measured 20Hz to 20kHz ref 1kHz
Mic to mix (+40dB) +0/-0.5dB
Line to mix (0dB) +0/-0.5dB
Distortion
THD + noise measured @ 1kHz +20dBu
Mic to mix (+40dB) 0.006%
Line to mix (0dB) 0.006%
Crosstalk
Referred to driven channel @ 1kHz
Channel to channel > 100dB
Mute shutoff
> 85dB
Fader shutoff > 90dB
Noise Performance
Measured rms 22Hz to 22kHz bandwidth
Mic EIN
-128dB 150 ohm source
Line pre-amp (0dB) < -91dBu
Residual output noise
< -98dBu (-102dB S/N)
Mix noise, nothing routed < -88dBu (-92dB S/N)
Mix noise, 24 channels routed < -86dBu (-90dB S/N)
Metering
Input meters 4 segment LED (signal, 0, +6, peak)
Mix meters 4 segment LED (signal, 0, +6, peak)
Output meters
12 segment LED
LED meter response peak reading
Peak indicators on 5dB before clipping
Signal indicators on -20dBu
Meterpod Illuminated VU moving coil meters