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O
P E R A T I O N
XLR Balanced Input
Check output of source unit for proper signal polarity
1/4" TRS Balanced Input
Check output of source unit for proper signal polarity
Pin 1
= GND
Pin 2
= (+)
Pin 3
= (–)
INPUT
FROM
SOURCE
Tip
= (+)
Ring
= (–)
Sleeve
= GND
INPUT
FROM
SOURCE
Many popular mixers use unbalanced outputs and can be used with the balanced inputs. To minimize residual
ground noise, we recommend using twisted pair cable or short cable lengths in this type of configuration.
XLR Unbalanced Input
Connect (–) and GND (shield) terminals at
both ends of cable to
prevent unstable amplifier operation
1/4" TRS Unbalanced Input
Pin 1
= GND
Pin 2
= (+)
Pin 3
= GND
INPUT
FROM
SOURCE
Tip
= (+)
Sleeve
= GND
INPUT
FROM
SOURCE
1
2
3
GND
–
+
1
2
3
SHIELD
+
SHIELD
SHIELD
+
–
+
INPUT SWITCH
The unbalanced input uses a conventional RCA phone jack.
Move the input switch UP to use this jack.
The balanced input jack is a dual function connector accepting
a 1/4" Phone (Tip-Ring-Sleeve) or an XLR plug. The 1/4" Phone
jack is connected according to conventional usage. The XLR jack
is connected according to the IEC and AES standard. Move the
input switch DOWN to use this jack.
Unbalanced Input
Balanced Input
ON
1
2
3
4
RCA
Unbalanced
XLR or 1/4”
Balanced
ON
1
2
3
4
RCA
Unbalanced
XLR or 1/4”
Balanced
