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Help please!
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My bass speaker on both channels has started to vibrate when I turn the volume up, this only happens when in phono mode. It is fine in CD mode. I have tried a different deck and a different amp but it still happens.

 

This is driving me mad!!

 Please help.
 

Thaiman's picture
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Re: Help please!

I have no clue....Is it not vibrate normally then? My bass cones are shifting air like a Hitachi fan right now. Smile

Anonymous
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Re: Help please!

 They are making a booming noise.

Andrew Everard's picture
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Re: Help please!

Perfectly normal. Caused by warping of the record, even to an extent which isn't really visible to the eye, causing the stylus to bounce in the groove. Or it could also be rumbles from the drive motor or bearing on the turntable, but this is less likely.

Old amps used to have a high-pass rumble filter to take out this very low frequency stuff. 

Anonymous
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Re: Help please!

I dont think it can be that, because it happens on all my records and when i change decks it still happens. Its really loud and drowns out the music.

Thaiman's picture
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Re: Help please!

user="kev b" wrote:

I dont think it can be that, because it happens on all my records and when i change decks it still happens. Its really loud and drowns out the music.

Ah in that case.....Something wrong somewhere! Does it just happen over night?

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Re: Help please!

Feedback? Could be.

Does it happen when the turntable is connected but not actually playing anything, with the amp up at the kind of playback levels where you usually experience it?

If so, it's feedback. If not, then it's presumably a fault with your amp's phono stage.
 

Anonymous
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Re: Help please!

 No, it only happens when a record is being played. I have tried it with two amps and the same thing happens. Its very odd. And very annoying!

Andrew Everard's picture
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Re: Help please!

Then if it's not the turntables or the amps, and it doesn't happen when you are playing CDs, I'm really rather baffled. Are the turntables located near to the speakers?

I still think it may be the cartridge picking up sound from the speakers and thus creating feedback. 

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Re: Help please!

Are you on Stealth mode Andrew....offline posting!

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