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You will have to remove the plate amp and look on the pcb, it is generally located near where the main power lines come in.
If you still can' find it contact Polk tech support, Ive owned several Polk products and always found there tech support very helpful; very helpful; Tech/Product Support
9AM-5:30PM EST Mon-Fri
1-800-377-POLK (7655) Option 1
FAX: (410) 764-5470
Run 2 RCA cables from the two Purple connections on your Receiver (Labled "PRE OUT SUBWOOFER") to the Red and White connectors on the back of your Sub (it does not matter which Purple connecter you plug into either the Red and White)
Set the volume control on the Sub to about 75%, and keep the power switch in the "ON AUTO" position. To set the Low Pass value, look at the back of one of the front speakers in your setup, and note its frequency range (will look something like 100Hz - 17kHz). Set the Low Pass at a value slightly higher than the low value on the back of your surround speakers.
To set the phase switch, stand in the middle of the room with some music on (something with some bass, but not over the top bass) and have someone switch between 0 Deg and 180 Deg. Listen for which setting sounds "Louder and Fuller". This is the one you want. You will need to do this each time you move the Sub, as its position may change its phase in relation to the rest of your system.
Your 2A 250v slow-blow fuse is blown, located under the back pannel. Mine just did the same thing. Problem is the problem with my PSW10 goes beyond the fuse. I have contacted Polk tech support to help me trouble shoot.