My subwoofers don't sound like they used to. Please help!?

Question

I've realized this problem for quite some time now. I owned this JVC HX-Z30 home stereo for about 4 years now. I can tell you right now that the subs are NOT blown. There are 2 sub channels. One went bad first and I thought it may be blown, but just to check I plugged the seemingly blown sub into the other channel and it worked again!! But now they both do the same thing. So I've concluded that something is worn out or gone wrong with those sub channels on the inside of the stereo. Is there anything I can do to fix this? Will I have to clean something, or possibly replace a part?

The bass isn't as punchy and fat as it used to be, it sounds somewhat blown but I know it's not. It sounds really chunky.

Thank you in advance for your help!!

Answer 1

By "seemingly blown sub", you mean the speaker cone isn't blown, right?  If you had a short in the voice coil of the "seemingly blown sub", it would sound bad and it could have damaged the amp output.

It might have seemed to work, but only because the amp was working extra hard to try to drive it, even with the short.  That abuse is what probably killed both of the channels.

You won't be able to replace any parts to correct this; it's entirely likely that it'd be cheaper to simply replace the stereo and bad sub(s?) than to have them repaired.