Constant loud muffled noise coming from the sub and speakers.
There is a constant loud muffled noise coming from the subwoofer and speakers even if no song is playing. It used to work perfectly and then randomly this happened. I never dropped it, didn't spill anything on it...nothing ...the only thing that makes sense is dust being collected inside.
Oh and at first only the front left that had the muffled noise and then within a day or two the whole thing became like that.
Just to clarify: if i turn the system on without anything plugged in there is that loud muffle noise...
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It may be the control itself too. In time, these controls can get dust build up inside it. There are volume control spray cleaners available from Radio Shack or other electronic parts stores. The cheat on cleaning the control is to just rotate it from stop to stop as many times as it takes to clear the noise.
I am having the exact same problem with my Harmon kardon PC speakers. It is related directly to the speakers (subwoofer). If you plug head phones into the headphone jack on the satellite speaker you will not hear the noise. I am still searching for a solution, I love these speakers!
a usual problem of a subwoofer just like my old sound system. Subwoofer generates a big heat on its device unlike ordinary speakers. better to send that to a technician to change a spare parts. it must be an ic problem got damage by over using.
Are these speakers that you have to plug up into a wall outlet. If so, the noise you here is the electricity flowing through the speakers as sound is made. If you turn the sound down on the sub and turn it up on what you are trying to listen to, then you can reduce the backround noise.
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.
I suspect that what you are hearing is the 60 cps of the mains. If the humming sound is coming the subwoofer itself, then it is possible that you have a defective/leaky capacitor in the power supply section of the subwoofer. In the subwoofer, if the buzzing sound is coming from anywhere else other than the speaker itself, then it is possible that you have a loose transformer again in the power supply. Unless you are comfortable working with testers and soldering irons, I would suggest an electronics technician who should be able to diagnose and fix it for you.