B&K ST2020 - Inputs; Outputs

Inputs
The ST2020 has two types of line input, unbalanced RCA’s and balanced XLR
connectors
Un ba lanced - RCA type connectors accept line input from the preamplifier’s
unbalanced output connectors. There are three input connectors, one
for each channel, that may be used to connect the amplifier to the
preamplifier. They are labeled R,C,L.
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.
Balanced - XLR type connectors accept line input from the preamplifier’s balanced
output connectors. The ST2020 has balanced line inputs for channel 1
(R) and channel 3 (L) only.
Balanced cable connector -
PIN 1 - GND
PIN 2 - (-)
PIN 3 -(+)
Operation - For balanced operation (channels 1 & 3 only), ensure the balanced switch
between the balanced inputs on the rear of the amplifier is in the ‘on’ (in) position.
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
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