Originally Posted by Bill Fitzmaurice
Good cabinets have little to no resonance. Achieving that has little to do with the material the cab is made of. Of course some materials aren't suitable, like sheet metal. There's nothing the least bit special about MDF, other than it's inexpensive and takes veneer well.
and it's reasonably stiff.
and reasonably strong.
and very consistent (don't have the problem with voids you would with, say, plywood.
and it can be gotten very straight (as opposed to, say, hardwoods)
and it's dense (which affects resonance and vibration)
Based on my experience in tiled rooms: It seems like different materials might reflect sound differently too.
It certainly not that other materials cannot be used (I've seen glass, brass, steel, concrete, various polymers, and fabricated marble used for enclosures); but nothing's been shown to be clearly superior.