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
Do a search in discussion forum under COMPLIANCE and it will explain tonearm cartridge matching.
I said in a previous answer I use the KAB rumble filter. I consulted the manufacturers of both my turntable and speakers, and after I told them everything I tried, other than changing the cartridge and or arm, I was advised that the rumble filter was the best option without degrading the audible sound quality. The speaker manufacturer told me you can severely damage the woofer if it oscillates so much that the woofer cones exceed their parameters.

Try out the KAB filter, you have nothing to lose. You can always return it within 7 days or sell it here.

Bob
Hi, **I suspect you are correct that it is NOT cart/arm mismatch (its rega and clearaudio). If I ignor the issue, wont the woofers be damaged by too much pumping?**

Right the first time. It's unlikely an arm/cart resonance problem and yes the woofers can be damaged eventually, especially if they bottom out. The major cause of woofer pumping is acoustic or mechanical feedback. If you get a wall shelf or suitable support and position where your speaker isn't playing directly on it, chances are you will cure the problem. If this isn't feasible maybe you should get a subsonic filter as suggested.
Regards,
You can reduce the size of the ports with some cut foam strips (assuming your handy). This will increase the damping factor and reduce the pumping. A peripheral turntable platter clamp may also help. A subsonic filter did not have any affect in my st-up. FYI, I use a pair of ported full range floor standing tower speakers with the port diameter reduced. Note that is would be extremely rare for your woofers to be damaged. Don't let the handful of responders get you paranoid.
Agree with Stereo5 - the KAB filter is the best thing going to eliminate this issue. I love mine - zip zero nada downside to using it, absolutely no negative sonic impact and 100% solves the problem.

I have mine between my phono stage (PS Audio GCPH) and amp (Cayin A-70T).