I've had my receiver and speakers for 4 years. It's a Sony STR-DG800, and small JBL satellite speakers with a subwoofer. After I moved some stuff last weekend, the subwoofer is no longer working while connected to the receiver. The subwoofer has a LFE input, which I've always used, and left and right RCA inputs, which I've never used.
I tested the subwoofer inputs by connecting my laptop directly to it, and it definitely woofs. I checked the receiver settings, and the subwoofer was set to "Yes." I even just now defaulted my receiver settings. Still nothing. I don't know whether this "subwoofer cable" I've been using is anything special or just a marketing ploy, but for the sake of testing, I tried connecting a nice RCA cable from the subwoofer output to the LFE input... and that also did nothing, so that suggests to me that my "subwoofer cable" is likely still OK. I guess?
Anyway, I'm at a complete loss here. Audio is not my specialty, and I feel like I've troubleshot the issue as far as I can on my own.