Turntable feedback from nearby speaker

captainvideo462009 · 2013-12-19T01:10:39+00:00

I've just gotten finished, (or so I thought) upgrading and servicing all th e equipment in my entertainment center. I just replaced my mediocre speaker s with a pair of nice 12 inch JBL's that were abandoned in the building we just bought. My turntable is an old Thorens belt drive, supported with a spring arrangement that I thought would absorb any vibration. The turntable is in a cabinet about a foot off the floor and right next to the left chan nel speaker. If I crank up the volume when listening to a record there is d istortion, the severity directly proportional to the increase in volume. At first I wasn't certain about this but you can actually "feel" the vibratio ns on the turntable base. There are these springs supporting the platter an d arm and these springs are "stuffed" with a foam material but this vibrati on is coming through anyway. I know that one solution is to relocate the sp eaker however the room is not large enough to do this. I was thinking of pu tting foam under the speaker which would be easy and perhaps even a soft fo am block under the turntable as well but I'm afraid that trying to support and level a turntable supported like this could be a nightmare. Does anyone have any ideas? Thanks, Lenny

Dec 19, 2013 29 Replies

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jurb6006 12 years ago

Why Phil ?

/the spongie things are to keep the coils of the spring from resonating, remember resonance ?

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jurb6006 12 years ago

BTW, removing the foam is not a good idea.

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William Sommerwerck 12 years ago

Correct. It provides damping.

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Phil Allison 12 years ago

"William Sommerwanker = F****it Idiot "

** Which is not wanted in this case.

FOAD you stinking moron.

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amdx 12 years ago

Well, if you're going to go there, He needs some noise cancelling speakers, that cancel at the turntable. Mikek

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dave 12 years ago

Why not fly the speakers? If you can't fly the speakers, why not fly the turntable? What is the construction of the room? Slab? Wood over crawl space? Is there foot traffic above? Can't fly the turntable. You want the speakers somewhere other than the same floor as the turntables. Did you try the "rumble" (infrasonic) filter? Did you try swapping left with right at the TT preamp?

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Phil Allison 12 years ago

"dave"

** IT MAKES NO DIFFERENCE !!

... Phil

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William Sommerwerck 12 years ago

I have one of the following. In fact I suggested the name to the manufacturer (or encouraged him to keep the name, I forget which).

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It sits next to the left-rear speaker, and I have no problems. (Qualification... My speakers are planar dipoles, and the stand is not far from the lateral null.)

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dave 12 years ago

How many discoteques have you built, Phil?

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gregz 12 years ago

You seem to be assuming mechanical vibration through mass is the problem, and not the air vibration.

Greg

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