So minor update. Found the coolest local warehouse today with all kinds of goodies. The guy that helped me builds home speakers, small world. They had every kind of wood stuff from wood flooring to big artistic cuts of cypress. Awesome place. So I picked up two 5x5 sheets of this..
Russian birch ply. A sheet of 7/8" and 5/8". Pretty solid stuff.
Makes me think for two IB12AU's I might be ok with just a single layer of 7/8". I bought the 5/8" layer for strength if needed. Plan is some aluminum angle on the bottom at least and top if necessary for rigidity and for fastening.
Your thoughts?
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