4 rotary potentiometers separately adjusting the output level of the 4 stereo systems (Left and Right)
4 push-buttons, without detent, that activate (LED on) the relevant outputs of the 4 stereo systems (Left and right)
1 “Priority” push-button, with detent, to activate the output of the selected system while excluding the previous one
1 “Left” push-button, with detent, activating all the outputs associated with the left channel
1 “Right” push-button, with detent, activating all the outputs associated with the right channel
“Power” switch

 
Rear panel:

1 connector to link the external power unit (supplied)
2 electronically balanced inputs of the Left and Right channels (XLR-M Neutrik)
8 electronically balanced outputs of the 4 stereo systems (XLR-F Neutrik)
All the inputs and outputs with the Ground-Lift switch

Frequency response (@-3 dB) 10 Hz to 20 kHz
THD + N 0.001%
Input impedance 22K ohm balanced
Gain 6 dB
Signal/noise ratio > 110 dB
Max input level 20 dB
CMRR > 50 dB
Separation between channels (@ 100Hz, 1 kHz, 10kHz) 76 dB, 55 dB, 36 dB
Max output (@ 10 K ohm) 26 dBu
Output impedance 600 ohm
Connectors: XLR-F inputs, XLR-M outputs
Power supply 230 Vac, 50 Hz
Dimensions (WxHxD) 482x44x205 mm
Weight 2.4 kg