How thick should the front baffle of speakers be?

So I shouldn't be able to put my martini shaker on top of the speaker and wait 10 minutes to sip?   :  ) 

+1 Erik
That makes good sense since eliminating micro vibrations to the cabinet through footers etc. greatly increases speaker presentation. I never knew what mine were capable of until I put them on ceramic ball type feet. 

While I think solid construction is important, another sometimes overlooked thing is keeping the speaker from moving in 3 dimensions. A woofer can make the whole speaker rock back and forth. YMMV of course depending on the mass of the speaker, but a cheap tweak is often simply to add mass to the top of a speaker.

Tall skinny speakers benefit the most. It's pretty amazing.

Best,

E

3/4 inch plywood as used in vintage Altec's and JBL's will work just fine!

plywood works. I question the use of large drivers 10" and above that can shake the wood. I also question the method of attaching drivers to the face of a cabinet. Where is the technology? I feel let down.