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OK, it really depends on the subwoofer and the size and number of capacitors you need to make the repair, BUT I was able to fix my $300 subwoofer for appx $4 in parts. It went from being a useless piece of trash to perfection in about an hour. In this video, I show you one of the most common causes of the irritating buzz or hum you get in a subwoofer as it ages. The capacitors in the circuitry that are responsible for filtering that hum out start to go bad over time. If you are handy with a soldering iron, or know a friend that is, then the fix can be a really cheap one. Hopefully this works for you and you are able to get something out of it. Let me know in the comments whether you have experienced this and tried the repair, and how it came out. This won't fix all the buzzing issues, but it can be the fix for a surprising number of them.