I've got the PSW303 subwoofer and a Harman Kardon AVR325. Both about 6 years old. In my house, the speaker wiring is already in the walls (done by the contractor) and there is a plate that has two connectors on it titled "subwoofer" on the front wall and one in the back corner wall with two connectors on it called "subwoofer". Obviously the contractor thought that back corner of the basment was a good place for a sub. It's not possible for me to use the recommended hookup by Polk in my instructions (running the signal first to the sub and back to the fronts) so I am left with wanting to use my "Pre Out" single jack on the back of the AVR325 labelled "subwoofer".
My question - I've got one preout subwoofer jack on the back of the AVR. But two connectors on the subwoofer plate on the wall. Would I run a RCA Y-Adapter cable from the subwoofer pre-out into the wall...and then an RCA pair out of the wall and into the back of the sub (Line in - filtered)
I'm pretty confused...as those of you who know what you're doing can already tell I am sure. Thanks for any help/advice you can give. I appreciate your time.