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Speakers "pumping" with record warps - normal?

I just set up my Technics SL-3200 with an AT440MLa cartridge, Sumiko headshell, and Herbies mat. The table is properly isolated on a Target shelf that is mounted to wall studs. Using the Hi-Fi News test record, I determined that the resonant fequencies of the tone arm are approximate 8Hz (vertical) and 7Hz (lateral).
I've noticed that on warped records, the speaker cones do a lot of low-frequency pumping (visible movement in and out). I'm afraid that I could damage the drivers if I turn up the volume. Is this a normal consequence of warped records, or do I have a resonance problem with my TT?
Thanks,
Mika
mwaller

Showing 1 response by pauly

pauly
1,012 posts
 
Yep it's 'normal' (I use the term normal very loosely) and you could most certainly damage your speakers.

You can solve the problem by using a rumble filter - KAB makes quite a nice one that doesn't cost an arm and a leg.

Regards
Paul
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