2. amps-preamps
  3. 167115-84789

Microphonic feedback?

Hi All

I am hoping you can help. I am running a tube integrated and a subwoofer amplifier to drive the second voice coil of my Gallo reference 3.1s. In this configuration when I turn up the volume of the subwoofer amplifier enough to activate the second voice coil/subwoofer I get a terrible bass feedback which quickly overwhelms the speaker and room. This does not happen when using solid state amplifiers. I think it might be tube microphonics ??. 
Any help or guidance would be most welcome.

Thanks in advance

birdfan
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Showing 1 response by cleeds

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cleeds
5,700 posts
 
What makes you think the feedback is related to amplifier tube microphonics? If you tap on the amp’s tubes, does it send an impulse thru the speakers?

Are you using a turntable for a source? If so, that’s the most likely origin of your trouble.
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