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Noise from speakers when playing basses

This problem just appeared out of nowhere, just started at one moment and won't stop. The deal is I get noise mainly from subwoofer whenever it plays basses. Some speakers also pick it up. If I turn down the bass level to 0 (subwoofer stops playing), sound is quite ok. Turn the bass back on and there's the noise. It is not constant though, it goes with the basses. I tried toopen the subwoofer case to see where the problem might be, but everything seems fine by look. Interestingly though I noticed when I pulled out the back panel noise decreased rapidly. Pulled it back in place and noise increased again. Makes me feel like the air flow is restricted, and with an extra opening it gets better. I don't want to throw it away especially when I know satellites are fine. Any help much appreciated.

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Hello, check and see if cabinet has loose screws or if back panel is tight,bass can vibrate screw loose.good luck! also look for anything caught in the woofer causing the noise.

Posted on Aug 02, 2008

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Hi,

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.

Good luck and kind regards.

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