Monster Power MPA 2250 Owner's Manual page 15

MPA 3250 CONNECTIONS
STEP 1 A For Unbalanced RCA Connections
1. Connect one end of the unbalanced RCA type interconnects to the preamp outputs of your receiver/preamp.
2. Connect the other end of the balanced interconnects to the appropriate channel inputs on the MPA 3250.
3. Set all Input Type Switches towards the Unbalanced Input.
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