But I can't remember the actual one I bought. It took some trial and error. A couple cheaper filters I bought also blocked the digital cable signals and prevented Video on Demand from working.
The link doesn't consider the TV cable, but that's usually the main problem, as the cable ground is back at the service entrance, as is the AC power ground, and the total wire run between them can be a hundred feet or more, which will pick up a lot of noise. An isolation transformer on the cable is a must. If your components have optical connections use them, as they don't introduce additional ground pathways.
1 - Coax from cable provider. Solution: try unplugging coax at original connection point
2 - bad ground causing a ground loop. Try a 3-2 prong plug for diagnosing the problem
3 - Bad RCA cables. try new cables
4 - RCA cables or connections on the plate amp not grounded properly. Google this topic
5 - Possible other electronic component running at the same time on that circuit. Try another outlet on a different circuit.
6 - Bad transformer or component on the amp in the sub. replace amp
HT: Yamaha RX-V565 | 3 X Energy Take FPS, 2 X VS Surround, 2 X Take LCR | DIY Subs: SDX12 APR15 & TRIO12 Dual APR 12's | 47" LCD
Music: Yamaha RX-V863 | 2 X Energy RC-70 | MA RXw12 Sub
Bathroom: 2 X Energy Take LCR
Car: Sony Xplod HU, Xplod 6X9s, Kenwood 4"s, Alpine 12" Type-S, Rockford Amp,...
I have a UFW10 with a factory-replaced amp, and I remember that the replacement amp looked like one of the ones from Parts Express at the time (it looked pretty different from the original amp). The sub is in a box now, and I don't remember which Parts Express amp it was, or if they still sell it. The DIY subforum here might be able to advise whether you should get an amp with "boost" or not. But I think you should be able to replace the amp without too much trouble. In the interest of convenience, I would start by looking for amps with the right-sized plate, and narrow it down from there.
If you love the UFW10 and want to buy mine rather than fix yours, I'm game for that, too. PM me. :-) Mine works and has very little time on the new amp. It took so long to get it fixed that I already had another sub by the time it was fixed. So it has just been sitting in a box.