Green Mountain Audio

I'm sure when you get them sorted out you will be quite happy with them.

How much do they weigh?

They are 2 piece and really heavy. I would guess 100 pounds each. 

Contact Scanspeak, give them the model #s and see if they have any or if there’s a very similar or maybe even improved version.  Start by going to the source. 

Speaking as a woodworker, veneering marble isn’t that straightforward. Since you are only doing one side, and since the affects of environment on marble and wood are very different, choose wisely and test. A self-balanced veneer - two sheets stacked in opposite directions - is more stable than a raw veneer. A paper backed veneer is even more stable. Marble is a strange product with adhesives - so contact cement may be out. I use heat lock - but have no idea how it would work with the marble. 

It isn’t really marble. It is a synthetic resin. I figured I would practice different techniques on the underside and see what sticks best. The material is very similar to cultured marble shower walls. I believe if roughed up it will hold. I generative titebond on both substrates, allow to dry, and then reactivate with an iron. I prefer this over contact cement as you can adjust for fit.