I've done a bit of experimenting with vibration control on my equipment (I don't have a turntable, so it's been mostly with digital source, amp/preamp, and speakers). Here are some of the things I've found:
-Sorbothane: Under a cdp, I found sorbothane pods to have an effect that I can't decide is better or just different. Found no effect under amp/preamp.
-rollerballs/stillpoints: Under every component, these have had a positive effect in tightening up imaging and cleaning up low frequencies. Have tried expensive solutions (Stillpoints, Aurios) and cheaper solutions (Final Labs Daruma) with similar effect (ie. the more expensive solutions did no more/less than the cheaper one).
-brass cones: had the exact same effect as rollerballs/stillpoints. Cones can be had for much cheaper.
-cork/neoprene pads: They seem to have a positive effect under my amp and my power conditioner. mapleshade calls them Isoblocks, but I founder cheaper versions at an industrial supply store that seem to work just as well. Do a search for "Vibration control pads" at
www.grainger.com. I use the 2"x2" version.
-weights: I use marble/cork coasters on top of my cdp ($20 from bed bath and beyond). They work. Do other things work better? Maybe, but they look nice and they are inexpensive.
-Maple cutting boards: *Great* effect, particularly on amplifier. Everything got better...imaging, dynamics, overall energy. Also worked well with cdp and preamp. Tried them under my speakers to terrible effect...completely smeared the upper bass and midrange. Used John Boos 2.25" thick cutting boards as well as JK Adams 2.25" chunk boards (
www.125west.com)...each board was less than $75.
-Neuance Audio shelves: Have not tried them in the same context as the maple boards, but they do work and they are not that expensive ($175/shelf). Ken Lyon (founder) is great to correspond with, even if you have questions for him that aren't related to his product, so I will plug for him here.
http://www.neuanceaudio.com/.
-A good rack: Basically all my maple boards became unnecessary once I got a Billy Bags rack for all my equipment (although I still use the maple under my cdp for psychological reasons

)