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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. I got Creative Inspire 5+1 P580 Speaker. 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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  • thegeko Jul 29, 2008

    Thank you for your ideas. I tried to press on the sub speaker, which did reduce the noise.

    However, when I pulled out the sub speaker from the case a bit, holding it in hands, there was no noise. All the speakers including sub were working fine. As soon as the sub speaker touched the case the noise started. This makes me think it is caused by the vibrations produced by sub speaker. Even when I (slightly) hit the subwoofer against the floor it makes the noise (even with bass level at 0). Do you think it might be somehow caused by vibrations in combination with some broken electronics?

    I have a DVM and a soldering iron. However if I try to pull out the electronics from the case to measure it, noise stops. Everything is really suggesting the cause are vibrations. I don't have any other speaker to try replacing sub, unless I buy it.

  • angel_cmrj Mar 22, 2009

    i have the same problem and i already had the same idea of how to fix it, but i don't know how to open the subwoofer to see the circuit. do someone knows it?

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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.

Thank you for using FixYa.

Posted on Jul 29, 2008

  • Louie  Role
    Louie Role Jul 29, 2008

    Hi again,



    Appreciate the postback. It would seem that you have a self-induced noise which is mechanical/structural and affecting the electronics. Having said that, suggested course of action would be:


    • resolder all the joints underneath the PCB, a cold solder or a loose connection;

    • use silicone sealant to coat components that would vibrate easily and cause loose connection later on such as big/tall electrolytic capacitors.

    • I would not suggest putting silicone sealant on any component that produces heat such as heatsinked transistors or ICs.

    • If the power transformer is also inside the enclosure, tighten the E/I core either by their bolts/nuts or crimping the shell body.

    • You may want also to apply sealent on the enclosure corners and any other portion that may vibrate due to the backwaves of the sub speaker.

    Alternately you may want to use a gluegun in the absence of the sealant or anything of similar nature.

    Cheers.

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