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Just got a new 7.2 receiver and am hooking it up to an older Polk subwoofer. The receiver has 2 subwoofer RCA outputs (monaural) and the subwoofer has a left and right RCA line input (it also has speaker level inputs/outputs but I don't want to use these). Can I use just one RCA cable to either of the left or right RCA inputs on the subwoofer? Or do I need to run 2 cables-- one from each of the subwoofer outs on the receiver to left and right inputs on the subwoofer. Or do I need an RCA Y adapter single male to double male? Thanks for any guidance.
 

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On a sub I had in the past with a plate amp built in you would run the mono sub out to the right input on the sub amp (leaving the left channel empty). I don't know if this is how yours works, otherwise just use a splitter. Bob
 

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Just got a new 7.2 receiver and am hooking it up to an older Polk subwoofer. The receiver has 2 subwoofer RCA outputs (monaural) and the subwoofer has a left and right RCA line input (it also has speaker level inputs/outputs but I don't want to use these). Can I use just one RCA cable to either of the left or right RCA inputs on the subwoofer? Or do I need to run 2 cables-- one from each of the subwoofer outs on the receiver to left and right inputs on the subwoofer. Or do I need an RCA Y adapter single male to double male? Thanks for any guidance.
It will work either way. Using both outputs may give you a higher output that can facilitate the auto-sensing on/off switching, if your sub has such.
 

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You don't need to use both inputs to the sub and if neither of the L/R inputs have an LFE marking you can use either one.
 
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