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HELP-woofer moves alot when playing lps

Hi-
When I play a record on my TT, I get an excessive amount of woofer movement, even when no music is playing. When I lift the arm off the record with the finger lever, the movement stops, and the phono stage is dead quiet. Its only when I drop the needle and turn it up a bit, the woofer starts to move in and out. I dont get this when playing cds, only lps. I have my system on a shelves, with the table onto and my integrated amp directly under my TT. Might this be an isolation issue? Thanks in advance.
tbromgard
stereo5's avatar
stereo5
6,394 posts
 
I have experience with the KAB rumble filter. I had the same problem in my system with my VPI turntable. The filter attaches through the tape loop and I can hear no difference in the sound quality with or without the filter engaged. It totally stops the woofer pumping/oscillateing.

There was one for sale on here a while ago. I bought mine new from KAB. The insides are stuffed with audiophile parts, so it isn't a cheap piece of junk.

Bob
reb1208
518 posts
 
Are your speakers sealed or ported.

This is a very common problem.

Search the net as this subject has been covered in depth countless times.
tbromgard OP
814 posts
 
ported.
yogiboy's avatar
yogiboy
5,690 posts
 
Cartridge arm mismatched. Not much you can do.
dan_ed
2,451 posts
 
It is NOT cartridge/arm mismatch. Ported speakers are a bit more susceptible to this. My old Aerial 10ts would do the woofer dance very well. Make sure your amp has enough headroom so you don't get clipping, put the covers back on the woofers. Stop watching them. The suggestions for a subsonic filter are good, but I have not heard one that didn't seem to damp things too much. It could work for you. You might have some success experimenting where the speakers are placed, but you probably can't eliminate it completely.

I have two, 18" drivers handling the duties down low. On a lead-in of a slightly warped record I can feel them pressurizing the room from side to side. :-)
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