Any tweaks recommded for under cd player?

This is thinking out of the box. I put my tube cd player on a sofa cushion and everything improved the highs,imaging and bass response.It cost me nothing 'just used from an old couch I don't have anymore. Just kept a couple of the cushions.Lokks like old yellow foam used from old cars from the 70's interior usage.
BUT WORKS

I think a leveled player is important as well, so the sofa cushion intrigues me. I had the walker audio valid points and replaced with the Finite Elements cera pucs-very happy with sound. I do agree that power cord, line conditioner and interconects-balanced for me-are the foundation, and then, isolation. All work together with synergy and then, when it all clicks-along with a great cd player, preamp, etc, digital, well, finally sounds good. SACD does blow my mind. Not always the emotional connection that vinyl gives me, but a very pleasing, musical experience.

"Ceramic" foot sanding stones at Walgreen's etc for ~$5.00.

goone: The mystery feet work very well under my cd player.

I tried Herbie's Tenderfoot under my cdp. It improved the quality of the denon cdp.
Has anyone else tried these Herbies Tenderfeet and did they find anything that was better?

I also tried cork/rubber anti vibration pads and they also helped a little.