HELP-woofer moves alot when playing lps

Not uncommon for warps or other imperfections in record geometry to produce subsonic rumble To some extent. Goes with the turf with hi fi phonos. resonance frequency of cart/tonearm can exacerbate the problem with certain combos more than others.

The biggest danger of this is that subsonic rumble uses power that is no longer available for music and clipping can occur sooner, impacting sound quality and putting drivers at risk, so be careful.

BEst solution is avoid records that have this problem too much as much as possible. Get a better quality copy. High pass filters are the common solution, but that is a band aid and effects on sound are usually noticeable.

Better yet, go digital. No subsonic rumble and other vinyl snafus there! :^). Digital can be very good for not much cost these days, much more so than in the past.

My Pro-ject Xpression III did this same woofer pumping issue. It was very noticeable as soon as the stylus hit the record before the music started. Same system, same table location, same cartridge, same phono pre, same high efficiency speakers (92dB Tekton 6.5t) and now totally gone now with a new RP6 (both tables were setup professionally by same shop). Was the motor vibration in the Pro-ject coming through the subplatter and platter.

I have the same issue.  Here are the things I've tried to solve the issue. Switched turtables: had a newer bottom line audio technica,  figured it just couldn't handle being amplified a lot (just bought classic cerwin vegas, wanted to really crank them up with some Rush vinyl).  So I tried my old Dual 505.2 with the same issue. Okay, swapped my yamaha receiver out with my wifes old Kenwood.   Same problem still.  Last attempt was purchasing a DJ-PRE2 preamp...  still did it! BUT it has a low filter... well I'll try that! Works great, and the sound quality is not better or worse, well better in  sense my speakers can concentrate on producing low end signals without the woofers going nuts!  Played some albums with some nice low bass, and it all sounds good.

What I've come.to believe is what someone said in the thread.  The stylus is picking up vibration from the speakers, so in a sense is creating a kind of feedback in the low frequencies. 

I recommend that DJ-PRE2 preamp, super mixer unit,  and it also has a gain for fine tuning! 40bux in Canada