B&K 2220 - Manual (Page 9)

Page 7 13004 rev 0004
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Outputs
Five way binding posts are provided. One pair for each channel. They are designed to
accept a banana-type plug or spade lug connector (shown below) and are color coded
for easy identification. The red (+) post should always be connected to the speakers (+)
jack. The black (-) post should always be connected to the speakers (-) jack.
Spade connector Banana jack
Here is a typical amplifier setup:
Inputs
Unbalanced - RCA type connectors accept line input from the preamplifier’s
unbalanced output connectors. There are two input connectors, one for
each channel, that may be used to connect the amplifier to the
preamplifier.
RCA cable connector -
Operation - For unbalanced operation, ensure the balanced switch between the
balanced inputs on the rear of the amplifier is in the ‘off’ (out) position. If
the amplifier does not have balanced inputs then it is always in
unbalanced mode.