Monster Power MPA 2250 Owner's Manual page 26

STEP 1B Balanced XLR type connections
1. Connect one end of the balanced XLR type interconnect to the preamp output of the receiver/preamp
you wish to use.
2. Connect the other end of the balanced interconnect to the right channel input on the MPA 2250.
3. Set Input Type Switch towards the Balanced Input.
STEP 2 Bridged Mono/Stereo Switch
1. Set bridged mono/stereo switch to the bridged position.
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