You rock.

A few minutes with some graph paper and a ruler shows that I can cut the panels from the 2 5x5 pieces of 1/2" Baltic Birch plywood I have on hand. What effect will the 1/8" thinner wood have on the tuning? Will using this wood change the sound of the speakers, and if so, how?

I expect that the plywood will be more resonant than MDF, but what that means for sound I'm not so sure of.

Also, my cutting plan leaves me a 28"x14" piece of wood that could be used for internal bracing. What kinds of bracing have people used?

--Shannon