Check your wires from the amp to the sub and if possible change them. If that makes no difference the powered sub or the amp have a intermittent problem, but I think it is more than likely the sub, there are probably bad solder connections that need fixing and maybe a good time to consider a repairman to take a closer look.
SOURCE: subwoofer pre-out wires
Sorry for the stupid question but is your subwoofer a powered sub? The subwoofer out is just a preamped signal that drives a powered subwoofer. Let me know then we can go from there.
SOURCE: Connect a Sony SA-W3800 powered subwoofer to a kenwood receiver
Yes. It needs to know you have a subwoofer or it won't send low frequencies out to one. Then you have to calibrate its level to match the rest of your speakers. Hit the SETUP section in the manual (available at retrevo.com).
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Its a VR-505 Receiver and a KS 303HT Sub. Reciever only has a Subwoofer PRE OUT. I have a Y wire running out of that, into the red and white that goes to the INPUT on the sub.
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