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My Onkyo SKW-520 subwoofer has not worked well for the last year or so. I have to keep the gain turned all the way up on the sub and the subwoofer output at +12 db on the Onkyo HT-R520 receiver just to hear a moderate level of bass response. This was not the issue for the first few years I owned the system.

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  • rpettit63 Oct 03, 2010

    Are you basically telling me I should replace the subwoofer? It's a < $100 sub, so I'm not sure how much cost / time I want to put into troubleshooting a serious internal issue.

  • rpettit63 Oct 03, 2010

    One of the experts suggested I need to open up the sub and troubleshoot all the electrical components. Does anyone have any other possible solutions here? When I put my finger on the end of the coax cable, I get a lot of feedback / volume out of the sub. It's just not nearly as loud as it used to be when connected to the receiver.

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If the sub-woofer has any electrolytic caps in it, you should change those first. Electrolytics dry out in a few years' time, and fail or lose their effectiveness.
Same thing with them in the main unit. If replacing the electrolytics doesn't work, the unit will have to be troublshot to locate the bad part.
Good luck, and hope this helps.

Posted on Oct 03, 2010

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This is caused by the aging of a component from the amplifier - as they age the capacity gets lower = the resistance to the lower frequencies increases = the sound gets weaker.
To fix that you must open the subwoofer and check all the electrolytic capacitors from the signal path - all the way from the input RCA jack to the output of the integrated amplifier.

Posted on Oct 03, 2010

  • Azrael SRL Oct 03, 2010

    Yes, the background noise has to pass thru the same circuit so it will also sound lower.
    Personally i would have fixed it myself, it's a 2 hour job. If you don't have the knowledge to do it, or you value your free time more, then yes, just get a new one.

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Posted on Jan 02, 2017

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The fuse blows when the current that passes through it are beyond its rating. This could be brought about by excessive consumption of the load, in this case the amplifier powering the sub-woofer.

Repairs would involve component level and require that you be familiar with electronic components and circuitry, use of a DVM and a soldering iron. Often it is just the finals that needs to be replaced. Of course we cannot discount the possibility of other components or section such as the power supply.

The smoke indicates something heating up such as a resistor or diode or a capacitor.

Should you be uncomfortable opening the unit and doing a DIY (do-it-yourself), then perhaps you need to seek the services of a qualified professional.

Should the downtime and cost of repair be no longer economically reasonable, purchase of a new unit might save you further trouble.

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.

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