I have a jvc kd x255bt head unit. I'm using the head unit to for my front and rear speakers and a monoblock amp to power my single 12 inch sub through the Rear/Sub preamp output from the head unit. I've set the [subwoofer set] to "ON" which turns on the subwoofer output. When I set the [SP-P/O] to Rear/Sub or Sub/Sub, it doesnt make a sound unless its set to Rear/Rear. Anyone knows why? The head unit does have a subwoofer level that can be adjusted if [subwoofer set] is turned on. Or Is it fine on Rear/Rear output?
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