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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 dan_ed

dan_ed
2,451 posts
 
The issue I see with using tonearm dampening is that it will affect the entire frequency range. If the woofer excursions are only with warped lps I can't see subjecting the entire vinyl collection to the dampening because of a few warped lps.

I think it is important to make sure these excursions are not pushing the amp into clipping. It takes large amounts of current to move those woofers like that, even if you don't hear any sound.
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