Unbalanced Operation - Bose 1800-VI Owner's Manual

For the quick connect terminal block, use the female connector provided. Pin 3 carries
the + (hot, non-inverting) side of the signal. Pin 2 carries the – (low, inverting) side of the
signal. Pin 1 is ground (see Figure 3).
If you are using the standard input module for either amplifier, the polarity of the balanced
inputs can be reversed by changing four jumpers located on the input board, just behind the
input connectors. If you are using the ACM-1 module for either amplifier, the polarity cannot
be reversed. Refer to page 12 for a description of the different modules.

4.6.2 Unbalanced operation

For the 1/4" phone jack, use a 2-conductor (tip-sleeve) 1/4" phone plug. The tip of the plug
carries the signal and the sleeve is ground. The ring connection in the jack is automatically
grounded by the sleeve (see Figure 4).
4.0 Installation
Figure 3
Quick connect terminal block
balanced input connection.
Figure 4
1/4" phone jack unbalanced
input connection.
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