Subaruguru is right on about the difficulties of working granite, only those with diamomd tipped tools need apply.MDF is just the opposite, cuts and routs absolutely clean with crisp edges and no tearout. Dimensionally stable so takes veneer extremely well. Knowing how it is made will tip you off to its qualities and popularity vis a vis particle board. Both are produced as "loaves" like bread but while particle board is pressed under 5000 lbs. pressure, 30,000 lbs. is used to compress MDF! You might try to find your local Wilson Art dealer as many fabricators are dropping the SSV (solid surface veneer) because of problems with fracture in use. SSV is an 1/8" thick sheet similar in look to Corian which is glued to a substrate (MDF). It could be cheap and works OK with ordinary carbide tools. Don't worry about the fracture problem as it only occurs in horizontal applications like countertops.
Speaker Enclosures
I have recently come into some granite counter top material(A neighbor is in the remodeling business and offered it to me). Has anyone had any success trying to make speaker enclosures out of this stuff? I have enough to make two medium enclosures but have no clue if it is even feasible to attempt. If any of you DIY'ers out there have any info I would appreciate it before I bite off more than I can chew.