Glass Shelf under CD Player or not?

I think it comes down to aesthetic preference. I doubt if blinded you would be able to tell the difference in sound.

I would consider Audiopoints with the Maple ( no Glass ) ..I am using a 2" thick Rock Maple slab with 1" high Audiopoints and it works fantastic....Vibrapods with Maple just blurred everything for me.......

I use different isolation and coupling devices in my system, but I find truth in J_goughnour's comment.

The best way to determine the answer is to listen with and without the glass (and with and without the Vibrapods).

Your opinion is the only one that matters.

What CD player are we talking about. Some CD players have good feet that are designed to be on a solid surface. If they are hard rubber feet, I would go try sorbethane feet to the chassis and use the glass directly on top of the maple to keep the sorbethane from possibly removing the finish on the maple. But as Cyclonicman and Tvad point out, you have the opportunity to AB or even C the possibilities.

It would surprise me if you hear a difference with or without the glass in this case. Try it and see.

In general, though, glass is generally quite capable of transmitting vibrations at higher frequencies and I am not fond of it as a material that lends itself to isolating components from vibrations effectively compared to other materials, like wood.