Since my parents don't like me turning up our current subwoofer that loud, I'd like to buy one of my own that I can guiltlessly turn up as loud as I want.

Our current sound system is kinda old (~8 years old?) but I think it was nice when we got it. It consists of 2 JBL towers and 1 subwoofer. I will be buying a subwoofer to compliment this set-up so I'm looking for suggestions.

Possibly useful information:
-Living in U.S.
-Yamaha stereo
-Will be used only for the purposes of listening to music
-$200 max, but preferably lower

Also, is there anything I should watch out for in general?

What you really need is a new amp.
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