DIY speakers of solid/reclaimed wood?

Bad idea guys. Wood expands and contracts with humidity. The various species do this at various rates. What we do to prevent cracking is float pieces that go across the grain to prevent cracking. The old raised panel doors are an example of this. The raised panel is floating so that it can move. Loose parts in speakers is not a good idea. This is the reason that most speakers are made with veneers. Manufactured products like MDF and plywood do not expand and contract so they can be used in box construction without fear of disintegration. MDF in particular has wonderful properties for speaker construction. It is dense, stiff dead stuff and takes a finish well. Those speakers look great now, talk to me in ten years.