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Turntable rumble: what causes it?

Noticed in my second system that the mid/woofer's of my 2 way Joseph Audio Pulsar 2's sometimes appear to be quivering during vinyl playback.  I do not hear anything but I can SEE the driver's moving.  Does not happen with digital.

Is this evidence of "rumble"?

Wondering if the etiology is the turntable itself (maybe the bearing or motor noise) or whether floor or room vibration is reaching the table externally?  The turntable otherwise operates silently, as best I can tell.

My turntable is a Pioneer PL600 (vintage) on which is mounted a Hana EL cartridge.  Amplifier is a Pass XA 25.  Preamp is a Classe Audio DR 5 (which does not feature a rumble filter BTW).

Thanks.
bobbydd
czarivey
5,946 posts
 
how far are your speakers from turntable?
for vintage turntables rumble filter is highly recommended so you might consider either add-on or phonostage with rumble filter.
bobbydd OP
97 posts
 
The turntable sits on an antique wrought iron table with glass top.  It sits about 5 feet from the speakers.  

BTW the table does have a decent suspension, and weighs about 25 pounds.
lewm
13,071 posts
 
There are long threads on "woofer pumping", and there are several possible causes.  You might do a search here and on Vinyl Asylum (go to Audio Asylum and select Vinyl Asylum from the list). VA has a good search engine.
lewm
13,071 posts
 
"The turntable sits on an antique wrought iron table with glass top. It sits about 5 feet from the speakers. "
I saw this post from you after having submitted my last post.  At least by description, your set-up sounds like a set-up for woofer pumping.  Not only is it possible that your tt is too close to the speakers, but glass is not an optimal shelf material for a turntable, suspension or no suspension.  Glass is highly susceptible to environmental influences especially including airborne energy from the speakers.
millercarbon's avatar
millercarbon
12,531 posts
 
The turntable sits on an antique wrought iron table with glass top.

Yikes! Won't hurt to lube the bearing. But ...  wrought iron... glass... there's your problem. 
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