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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 mwaller

mwaller OP
17 posts
 
Hi Raul -
I've measured the reonant frequency of the tonearm/cartridge combo - it's roughly 8Hz (at the low end of the desirable range).
If I want to increase the resonant frequency, I'd have to find a cartridge with an even lower compliance... is there such a thing? I thought that the AT440MLa is about as low as the come... any recommendations?
Mika
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