Mono-Inputs (Mic/Line) with Inserts : 24
Stereo-Line/Mono-Mic-Input Channels : 4/4
Stereo-Effect-Returns (Line) : 4
Stereo-Tape-Return (Line) : 1 left/right
Busses
Subgroups : 4 
Aux Pre-Fader (Monitor) : 2 
Aux Post-Fader (Effects) : 2 
Aux switchable Pre/Post-Fader : 2 
Master L/R : 2 
Mono-PFL : 1 
Stereo-AFL : 2
Outputs 
Subgroups (with Inserts) : 4 impedanced balanced 1/4 inch jacks
Aux Pre-Fader (Monitor) : 2 XLR (balanced)
Aux Post-Fader (Effects) : 2 impedanced balanced 1/4 inch jacks
Aux switchable Pre/Post-Fader : 2 XLR (balanced) 
Master (with Inserts) : 2 XLR (balanced) 
Master B Out : 2 XLR (balanced) (switchable Mono/Stereo, pre-post Fader) 
Tape Send (Recording) : 1 Stereo (Phono) 
Direct Outputs (1/4 inch Jack) : 24 
Stereo-Headphones : 2 Stereo-1/4 inch jack 
Stereo-Speakers : 2 impedanced balanced 1/4 inch jacks
Input Impedance 
Mic 2kΩBalanced
Line 20kΩBalanced
Input Gain 
Mic Continuously variable 0dB to +60dB 
Line (Mono Channell) Continuously variable -20dB to +40dB 
Line (Stereo Channel) Continuously variable -10dB to +20dB Line Level Inputs 0dB
Maximum Input Level 
Microphone and Line +22dBu 
Line Level Inputs (Mono) +42dBu 
Line Level Inputs (Stereo) +22dBu 
CMR at 1kHz 
Mic (Gain +30dB) > 80dB Line > 40dB 
CMR at 100Hz 
Mic (Gain +30dB) 70dB typical 
Frequency Response (20Hz-20kHz) 
Mic to Mix (Gain +60dB) + 0dB to -1dB 
Noise (20Hz-20kHz) 
Mic EIN ref. 150Ωgain +60dB -129dBu 
Mic EIN ref. 150Ωgain 0dB -107dBu 
System Noise (20Hz-20kHz) 
Summing Noise (12 channels routed, faders down) -90dBu 
Line to Mix Noise (12 channels routet at 0dB) -84dBu 
Distortion at 1kHz 
Mic to Insert (+30dB Gain. +20dBu Output) Typ 0,0007% 
Mic to Master (+30dB Gain, +20dBu Output) < 0,009% 
Crosstalk at 1kHz 
Channel to Channel < -80dB 
Mix to Mix < -80dB 
Channel to Mix < -80dB 
Fader Attenuation > 100dB 
Switch Rejection > 100dB 
Output Impedance 
Line Outputs 75Ωbalanced 
Headphones to drive 32Ω 
Maximum Output Level 
Master Outputs +25dBu 
Line Outputs +22dBu 
Headphones +22dBu / 600Ω 
Nominal Signal Level 
Microphone - 60dBu to 0dBu 
Line 0dBu 
Equaliser Mono Channel 
Hi Pass Filter 2nd order Butterworth, 80Hz Treble +/-15dB at 12kHz (Shelv) 
Hi Mid Continuously variable 100Hz to 2kHz (1 Oct) +/-15dB 
Lo Mid Continuously variable 400Hz to 8kHz (1 Oct) +/-15dB 
Bass + /-15dB at 80Hz (Shelv) 
Equaliser Stereo Channel 
Treble +/-15dB at 12kHz (Shelv) 
Hi Mid 3kHz (1,4 Oct) +/-15dB Lo Mid 300Hz (1,4 Oct) +/-15dB 
Bass +/-15dB at 80Hz (Shelv)