Green Mountain Audio

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. 

Get in touch with the Speaker Exchange in Tampa, they can reform the drivers. They have done excellent work for me on JBL and Tannoy drivers.