Unbalanced Operation - US Blaster USB 7132 Owner's Manual

USB 7132 / 7133 / 7134
Professional Power Amplifier
INPUTS
For each channel, there is a 1/4 phone jack socket and female XLR socket provided for signal input
on the rear panel of the amplifier. Each is electronically balanced at an impedance greater than 20k
ohms.
The phone jacks and XLR connectors are internally wired in parallel, and therefore either socket
may be used for the input signal.
The HOT, +, or in phase connection is to pin 2 of the XLRs and the TIP of the phone jacks.
The COLD, -, or out of phase connection is to pin 3 of the XLRs and the phone jack RING.
Pin 1 of the XLR s and the phone jack SLEEVE are internally connected to the chassis. The screen
of the input cable should always be connected to one of these points to ensure that EMC regulati-
ons are met. The cable shield ground should also be connected to the equipment which is providing
the input signal.

Unbalanced operation

When feeding the PA series amplifiers from unbalanced sources, connect the signal conductor to pin
2 of the XLR or the phone jack TIP, with the cable screen going to pins 1 and 3 of the XLRs or the
SLEEVE and RING (If avaialable) of the phone jack.
For bridge mode operation, signal can be provided from either channel 1 or channel 2, or both, but
no matter how to input the signal ,the output level is only controlled by channel 1 attenuator.
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