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.
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.