What footer best under cd player

Just to give you more decoupling options, Hyperion Magnetic floaters (two opposing magnets so no direct contact between surfaces) work very well for me and they are about $70 for a set of four. With heavy bass playing I can feel vibration with my finger tips on top of various pieces of equipment resting on suspended oak shelves including some with the rubber/cork/rubber decouplers. With the Hyperion's there is no vibration felt by the fingers and the sound is improved in many dimensions.

I have found soft shoe type solutions on Digital sources, DACs, and Transports or all in one players have benefited along with putting a sand bag on top of the transport unit, basically absorbing all airborne and mechanical vibrations from the unit...

However using Spikes not as good of luck, normally made the soundstage fall a bit flatter and harder. Bass sometimes seemed to become more anemic etc...

But Spikes on turntables is exactly the opposite! Solid spike footing in this case is far superior on some heavy maple blocks over soft shoes.

I recently discovered Aktyna A.R.I.S feet, that I tried under the Ancient Audio Lektor V I have been auditioning - and left them there without thinking twice (exit more expensive contenders Stillpoints and Harmonix BeauTones). In fact they were to some point decisive in wanting to keep the Lektor. In this combination they stood on a Lovan Classic platform, so that is MDF and not entirely comparable to your wooden surface. If you have an opportunity, I can only recommend to give it a try. Pricewise (in Europe) they come for EUR 200-250 for a set of 3.
http://en.aktyna.eu/product/product.html

As others have mentioned, there is no "best" and no real way to determine what works best for you except experimentation. It is NOT the case that the more isolation/absorption of vibration the better the sonic result. A bunch of friends tried different footers and exotic shelves under an Aero Capitole CDP once. The "better" the isolation (going from lower grade of Symposium shelf to higher grade) the more harmonically bleached and lean sounding the player became.

On my own player (Naim CD555), there is relatively small changes wrought by changing support.

You just have to try and see what are the results.