Isn't Corian a stone/resin composite? Easy to cut, but doesn't it resonate?
Corian is a brand name, one of many in the solid surface realm. Besides colorants and maybe a little aggregate of some kind for looks, all solid surface material is either polyester or acrylic resin...no stone. Mass produced by several big guns in the surfaces world it comes in 52-55" x 120" sheets, typically about 1/2" thick and looks the same on edges and faces.
Worked with carbide tooling.
Cultured stone or cultured marble is polyester resin mixed with stone dust, usually marble and mostly custom manufactured on a more regional level although that's not always the case. It's floated in molds so the finished product has a definite face side which is produced by the mold itself. Worked with carbide tooling or even steel in some cases.
Then there's engineered stone or quartz...same thing, different names. This is primarily stone (around 90%, IIRC), mostly quartz, that has binder and colorant added to make it pretty. Worked the same as stone with diamond tooling.
They all resonate albeit at different frequencies.
They are other materials that might have a place in the speaker building. Paperstone comes to mind. My countertop guy has all kinds of interesting stuff around his shop, but little interest in speaker building...I have broached the subject with him.
Seamlessly integrating any of these into an MDF of BB would be problematic because of differing expansion/contraction rates. Mo betta to have something that mounts into or onto the baffle itself as a separate piece. I envision this as something similar to the different faceplates that were available for the Neo drivers. but obviously deeper and more substantial to form a bigger waveguide. That's speculation on my part.
