Any tweaks recommded for under cd player?

I use stillpoints, doesn't really extend the high end but makes it more defined, improved sound stage depth and adds clarity. I have at times tried to remove the stillpoints as I struggle with $1200 worth of little black cones under my equipment but the stereo is just a little shallow without them. They seemed to make the biggest difference under the amp, then preamp and phono then CDP. But a difference under each.

Brass cones:Audio Points,Mapleshade or the Bear Claws.All available used and the BCs are available thru AudioGon.

Black Diamond Racing, cones, pucks , shelves. The progression for ease of presentation but still detailed and dynamic.

New Item: Blackholes. These were developed by Peter at Red Point Audio. Dan Wright at Modwright is handling distribution. I bought a set of 3 for under my Phono Pre.
I have had just about all of the tweaks out there. These did so much more then any I had used in the past. At this time I was without a CD player in my main system. I did have a 13 year old Sony that was used in my HT years ago.
I thought, why not. I put the Blackholes under this 13 year old player and you would swear it took it to many levels above what it was.
I then ordered my second set that day.

Thanks for all the responses, the only tweak I had tried is Shumook super cone current under mine pre-amp, does not sound good under mine cd player, the player is sitting on original cone and piece of maple platform would like to get little more extended out on the high.