Bill Epstein Messages: 1088 Registered: May 2009 Location: Smoky Mts. USA
Illuminati (2nd Degree)
Hey Chef - you might find this link http://www.hpva.org useful, the Harswood Pywood and Veneer Assoc.
What Wayne says about voids and loose bits is all too true. Lumber core is no longer a guarantee of quality, either. Baltic Birch, even with all the 'footballs' these days is the best choice.
I quit working with MDF, it's too nasty/dusty to cut and too fragile on edges. My last speakers I built with a premium plywood from Lowes, Arauco, and it had no voids or looseness. That's taking a chance, tho. There's also ApplePly and other plastic and/or wood lattice cores but they cost.