I often hear of amp/cab builders mentioning "void-free" plywood as a thing of the utmost quality. My brother and I (really him) built an open-backed, Fender style cab from Home Depot plywood which definitely had voids in the ply (2x10 cab). This cab has a warmer sweet tone than my other top quality void free cabs. especially hooking up a tube amp and running overdrive - I can't believe the projection and warmth of this thing. Have I discovered plywood "tone chambers"? Anyone else have a cab built on this type of wood? Anything I'm not considering with using "voided" ply for a cabinet?