I was playing a song and decided to turn the sound and bass all the way up. Bad idea. Suddenly, all sound stopped. I'm pretty sure the speakers just blew out or something. Now, no sound will come out of them at all. Any ideas on how I can fix this? Everything is still plugged in and I tried just restarting, but no luck. Suggestions would be appreciated.
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You have connector problems- probably bad/bent/worn "jacks" in the speakers or they may be dirty (oxidation, etc) or fatigued. If you can get to the Jack on the inside of the speaker make sure it is making good contact with the plug. Clean the surfaces using alcohol on a Q tip or cloth. Many of these type speakers are not serviceable.
Offhand, could either be the subwoofer speaker itself or the electronics (amp and/or crossover). One way to determine is by physcially checking the sub speaker. When playing with bass on, pls try restricting speaker movement by pressing on it and see if the noise is reduced. Another is to temporarily replace the speaker. You can try speakers meant for the car, home entertainment or book shelf, just dont set the volume too high.
If the speakers are ruled out, then it would be the electronics inside. For this, you would need familiairty with electronic components and circuittry, a DVM and a soldering iron. Access to an oscilloscope and an audio signal generator would be nice but not a necessity. The idea is to inject a constant audio signal and determine where the noise (if electronic) is coming from. In most instances, it would be a leaky electrolytic capacitor either in the input stage or feedback loop. At other times, it would be also a capacitor in the band pass filter.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.