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Sony SA-WMS815 loud buzzing noise intermittently

When I turn on my subwoofer, it works for a while just fine... then suddenly I get this very very loud buzz and it's so loud it makes us jump from our seats !!! I turn off the speaker for a few seconds, it "resets" works fine again, and then unexpectantly the buzz hits again... Very annoying and LOUD !! Any suggestions??

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Posted on Jan 02, 2017

sanjin
  • 56 Answers

SOURCE: subwoofer noise

You didn't say is your sub active or passive.If its active first check signal cables from theater system,power line of the sub, it has to be the same phase as the system.If its passive take a voltmeter disconnect the sub from the system and measure for DC voltage on the SUB output on the system when its OFF.If DC voltage is present your amp is damaged.It can also be that the preamp circuit for the sub doesn't mute the input when unit is on stand by and you hear frequency of your power supply (50-60Hz) on the sub

Posted on Mar 10, 2008

  • 1 Answer

SOURCE: Sony Active Subwoofer noise

need a schematic for a sony sawmsp1 active subwoofer....anyone????

Posted on Jul 17, 2009

  • 25 Answers

SOURCE: Loud buzzing from Kef PSW1000 Subwoofer

yes. A good idea. Kill power to the sub, then unplug and remove everything from the sub. go ahead and plug it in again and check for buzzzz.
That is test one. if you have buzz still, its the sub assembly. bad luck, but not impossible. If the buzz is gone its one of the signals to the sub. They can produce a buzzz without any signal coming from your stereo equipment. Replace the feed line, enjoy! BTW...Kef sure does sound clean. good choice.

Posted on Nov 09, 2009

  • 31 Answers

SOURCE: Constant noise from Mirage NanoSat 5.1 System Subwoofer

sounds like an earth fault either with the plug circut or more likely with the power board of the unit.

Posted on Jan 06, 2010

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If the cap. says 16v 4700pF on it, for example, a 20v 5300pF or a 16v 6200mF cap. will work for this application.

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I have had the same problem with my Sony sub. It sounds like it is picking up electrical noise and would not go into standby when the reciever was off. I rerouted my wires and changed to a much higher quality wire. I was using a very low quality stranded copper with thin insulation to start with.

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It probably buzzes all the time, you just notice it when it is outputting little volume. Check the cables for loose connections or replace them with other cable as a test.

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Loud buzzing from Kef PSW1000 Subwoofer


yes. A good idea. Kill power to the sub, then unplug and remove everything from the sub. go ahead and plug it in again and check for buzzzz.
That is test one. if you have buzz still, its the sub assembly. bad luck, but not impossible. If the buzz is gone its one of the signals to the sub. They can produce a buzzz without any signal coming from your stereo equipment. Replace the feed line, enjoy! BTW...Kef sure does sound clean. good choice.

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The circuit that should be turning the sub on and off based upon the presence of an audio signal is not working correctly and the sub is trying to reproduce 60 cycle hum. The unit needs service.
Dan

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