Compared with what has been suggested here (Subaruguru excepted) you will get a similar magnitude of improvement as moving from stock cords to kilobuck PCs if you buy a welded steel rack, spiked to the floor and spikes supporting a Neuance shelf, and no fancy footers or cones. There may be other shelves such as Torlyte that will also work, but I have tried the bladders, sand, cones etc, and while they all change the sound, none of them come close to removing the effects of vibration. Someone will accuse me of plugging Neuance too much soon and so I will keep quiet, but you guys don't know what you are missing.
Sand bags under a cdp - didn't work well
Last night I started the process of vibration control with the use of sand bags (3) under my Arcam cdp. What I found was that while everything became more focused/detailed it also became more sharp/harsh/forward/aggressive. I didn't know what to expect but it certaintly wasn't this. Van Morrison's voice on trk #5 on Sailing to Philadelphia was abnormally aggressive and in the end I preferred the sound without the bags. Any thoughts as to why things became too sharp & aggressive????