Re: MDF for Speaker Cabinet!
Wow...this thread takes me back! I remember cranking out custom sub enclosures 20 years ago for autosonics.....High SBL sub boxes mostly.
Anyway, the reason we use(d) MDF over ply was that the MDF had a low resonance, it was a very "dead" enclosure.
Depending on the size of the drivers, go with 3/4" at a minimum, if you want the ultimate sound though, sandwich a layer of dynamat between two layers of 1/2" (use the factory adhesive on one side, 3M Super77 on the other to glue the sandwich together) and reinforce with 1" screws. Fill all of your screw holes and dress all your edges and seams with bondo, then gelcoat or wrap with hot vinyl
I dream of a better world, one where chickens can cross roads without having their motives questioned.