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Allen-Heath GL 4000 Manual

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7
SPECIFICATIONS
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 ................... < -87dBu (-91dB S/N)
Mix noise, 24 channels routed ............ < -81dBu (-85dB 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
… 8 …


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