Inputs - B&K Reference 2220 Owner's Manual

Balanced - XLR type connectors accept line input from the preamplifier's balanced
output connectors. There are two input connectors, one for each
channel, that may be used to connect the amplifier to the preamplifier.
Balanced cable connector
Operation - For balanced
operation, ensure the balanced switch between the balanced inputs on
the rear of the amplifier is in the 'on' (in) position.
NOTE: If the amplifier is equipped with level controls, the balanced inputs will not
be present.
Here is a typical input setup

Inputs

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