The left speaker occasionally makes a buzzing noise. It kind of sounds like some sort of feedback or interference. I'm wondering if this is a problem with the speaker or with the hookup (speaker wires, input etc).
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replace the speaker with a new one :-)
it can be aproblem with the amplifire !!!
if it bad in high levels and good in low its a speaker
if its bad all the way its a burn chanell in the AMP.
The rechargeable battery may be exhausted and probably needs to be replaced. Try www.ebay.com type make and model of Capsule Speaker and scroll through the list. The only other option is try the manufacture, contact customer support and the technical department.
Sounds like local interference by nearby electronics. If it regularly makes this sound when used in an entirely different place, then I would begin to suspect an internal malfunction. Otherwise it could be a baby monitor, or police scanner, etc. Or something on the same circuit making electric noise. Try plugging it in a different room ( maybe you have done this already). Perhaps one of these is it. I hope so.
at medium volume push the speaker cone with your hand ( be gentile and push it several times) if the speaker make sound again then the problem is the spaeker and must be replaced , if its possible switch the speakers from one channel to the other channel to see if the problem is the speaker or the output channel
If you have never overdriven the speaker, it'll probably be a dry solder joint in the crossover. Take all the screws out the back panel, the crossover is mounted on that. Unscrew the crossover board, redo all the solder joints, finaly make sure the cheap spade terminals are connecting to the speaker properly, then put it all back together. You can check all the connections if you have a multimeter. Same happened to me.
I assume these are the complimentary pair that drive the speakers. On one of the speaker. You know I think you have a short in the speaker that it drives. Speaker can fuction even if there was a problem with it. I think what happened is when the original transistors shorted out it overloaded the speaker, but not to a point where it is burnt. There is nothing that can overload a power transistor except the speakers, I design a lot of amplifiers, the base input can overload it if you put dc in there, but that would make a the sound all distorted, I assume the sound seem fine. Solution is try connecting a known good speaker and I bet it wont burn out anymore. Even if the speaker look fine don't trust it.