What do you put underneath floorstanding speakers?

the suggestion that rlwainright made works great,the pads he is talkin about are made of rubber, i use a simular product called (humane pads).

the density of the humane pads far exceeds anything you will ever get at home depot or places like that,humane's are 1" thick x 3ft x 4 ft & are coal black.

these pads are kinda pricy though at around $100 each but they work great.

mike.

For my B&W CDM 9NTs, I recently put a 1 1/2" thick soft wood plank(14"x 10"x1 1/2")not MDF, with amazing results.IMHO the improvement is dramatic with the CDM series because the spike quality is awful.You can effectively embbed the speaker in the softwood such that there is no lateral movement.Of course this home spun technology will only work for relatively lightweight speakers. The 9NTs weigh 26kgs or so, or 60 lbs.
Have a great new year.
Sunnyboy

Timken Bearings in conjunction with DH Cones sound superb

Details

Should have checked backed sooner.

..........Pads of concrete.

Thanks Speedball! I wasn't sure what you were referring to.