Behringer ULTRA-DYNE PRO DSP9024 User Manual page 43

+
Output
Pin 1
2
Pin 2 = (+) Signal
Pin 3 = (-) Signal
+
Cable
1
Shield
(+) Signal + Hum
(-) Signal + Hum
3
RFI and Hum
Input
Ground
1 2
Positive
3
Negative
E
(+)Hum + Signal
(-)Hum + Signal
2 x Signal
= Signal + 6 dB