woofer pumping

A KAB rumble filter will solve the problem.I use one and very happy with the results.

There's a subsonic filter on the 640p but it doesn't do all that much... there's a bit of a difference, but slight.

Listening room is about 12x16 with the speakers setup on the shorter side (turntable is about 4ft to the side of one on the speakers). I'm moving from my current place soon which is why I haven't invested into a serious audio rack yet, but that's something that I'm looking into getting in the future.

In the meantime, would the maple platform and isoblock footers help the situation? (also not sure if the 4" would provide any advantage over a 2" in this case).

i use the cambridge 640p with a vpi scoutmaster and have no issues with rumble. i would think you should look into purchasing some manner of rumble filter first and then concentrate on better isolation after that.

IT SHOULD HELP BUT REALLY IT SOUNDS LIKE THE ROOM AND SETUP MAY BE ON THE SMALL SIDE. THE TT IS MOST LIKELY PICKING UP SOUND WAVES IN THE ROOM.

I CANT COMMENT ON THE BENEFITS OF A 2" VS 4" PLATFORM FOR YOUR TT. IT COULD BE SITTING ON A SLAB OF CONCRETE AND THE TT WILL STILL PICK UP SOUND WAVES IN YOUR ROOM.

START WITH THE 2" AND HOPEFULLY IT WILL TAME IT DOWN ENOUGH FOR YOU TO LISTEN TO YOUR VINYL UNTIL YOU MOVE INTO THE NEW SPACE

DIRECT DRIVE TT ARE NICE AND EAST TO USE BUT YOU DO END UP WITH SOME SOUND QUALITY ISSUES FOR THE ADDED CONVENIENCES

I second (third?) the KAB Rumble filter suggestion. Really no sonic compromise I'm able to discern when using it -- no more woofer-pumping, and the 'table is also actually now less vulnerable to footfalls (no more tiptoeing around when listening to vinyl).

Another benefit besides the obvious reduction/elimination of woofer pumping is that your amp (and sub(s) if applicable) will no longer waste a lot of energy and effort trying to reproduce those inaudible low frequencies that cause those woofers to frantically pump away. No point in having your amp struggle to reproduce something you can't hear (and can only 'see').

Got mine here on Audiogon used for around $150 - turned out to be a great investment for me. Any concern I had about adding something into the chain and possibly degrading the delicate phono signal has been far outweighed by the more effortless overall presentation I'm getting when listening to records.