Sub is triggered without signal
I have a Klipsch RW-12D that I have had for about a year and a half, purchased brand new. It has worked perfectly up until now. I moved the sub location slightly, but it is still plugged into the same outlet it has always been plugged into. Other than that, nothing has changed with my setup, so I know it was perfectly functional for a long time. When I turn the sub on, it makes some light crackling noises, which come and go. I kinda ignored it, but then I was watching tv and the sub hit HARD every 10 minutes or so. For no real reason (i.e. there was definitely not that kind of signal coming from my media). The crackling occurs even with the signal wire completely unplugged from the sub. So basically, there is a phantom signal. The other thing I noticed, when I was playing around with it, is that even with a bass-heavy signal, the sub is not hitting very hard (I can see it firing, but it's very sub-par compared to how it used to perform). I am not very knowledgeable about this stuff, but I assume the most likely culprit is the sub's amp? I just want to have a basic idea of what the potential culprits are before I deal with customer support. Thanks all!