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This is good info; thanks gentlemen. I'm not too concerned with the weight as they are gonna be heavy regardless. May even opt to put handles on them. I've worked a lot with MDF and it is dusty and isn't forgiving if you lose a chunk (bondo time). My main concern is if by using MDF will I be killing any desired resonances? I'm not a speaker designer so maybe my concern is unfounded.

A question for all of you out there. I am building a new set of Cornwall cabinets and would like to know peoples' opinions on whether I should build them out of veneered MDF or veneered plywood.