Question about Monitor Audio FastBass FB212 Subwoofer

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Monitor Audio FB212 buzzing

FB212 does not go automatically into standby mode, so when there is no signal coming from the receiver it still buzzes, like 60Hz. If I manually switched of and than put back in Auto mode it goes to StandBy, red light comes on and its silent, but as soon as signal comes in or I manually move it to On and than back to Auto, the green light for On stays and buzzing is there. It only stops if Offed manually. Help!

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Apparently there is an issue with the 10000uF 80V capacitors. They are poor quality ones and the issue is that the dielectic forms hydrogen internally which eventually blows the dielectric out.

Posted on Jun 28, 2009

  • alastairbell Jun 28, 2009

    Just replaced the 4x10000uF capacitors on mine and its fixed it.

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Monitor Audio FB212 Subwoofer need Schematic/service manual. I have the amp has been burned some resistor, i can not see what value of them. Please scan send to laidungvn@yahoo.com, Thanks so much

Posted on Aug 12, 2012

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