B&K 220M - Manual (Page 9)

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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
The Reference 220M amplifier has two sets of binding posts on it. They are paralleled
inside the amplifier.
The Channel 3 output is used for normal operation.
The amplifier comes standard with a Channel 1 and Channel 3 output. The Channel 3
output is used for normal operation, but you can use the Channel 1 output to connect to
another speaker in parallel.