Check the physical condition of subwoofer to make sure that the surround has not rotted out or been blown away. If ok, then using an ohm meter check for the nominal speaker voice coil resistance to make sure it is within spec. If both of these areas are good then you have destroyed the output stages of the amp(s) driving them. Every 3 db of bass boost doubles the output power. So if you are blasting along at 100 watts and you jack up bass by just 3 db the amp now has to put out 200 at those lower frequencies; go up by just 6 db and you are now talking 400 watts! And what does that do to an amp when you over drive it? You guessed it!
Hi, Ive finally found the problem with my system :o) Its not the subwoofer its the DVD unit!!! think outside the box. Mine was randomly switching into headphone mode, so i pluged some headphones in took them out and walla its working fine. Not sure why this happaned perhaps some dirt or something else got inside there???? Let me know if this helps
SOURCE: WOOFER NOT WORKING JVC th-m606
I'm having the same problem. It seems that the mosfet's shorted blew up a capacitor and took some surface mount parts with it. It will be the middle board with the metal shroud (shield). The mosfets are almost impossible to find, I have replaced them (as well as other parts) but still have yet to find the problem. I'm now trying to find the subwoofer amp board (part#LVA10505).
you will need a line-level converter to use this subwoofer- it is a rectangular-shaped box with wires coming out on one end and red-and-white RCA plugs one the other. The end with the wires coming out will hook to the receiver, and the other end will need to plug into the sub.
Hiya, sorry that will have to go in for repair as it sounds like it may be protecting. Could be something loose but that would be lucky. Suggest finding a electronics shop in area that can assist. Best of luck
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