Erich (and everybody else)---I've been doing some reading lately, and just saw something on the Linkwitz website related to these sub boxes. You all may have already seen it, but since someone said here that Erich's sub box designs are over-braced, I thought I'd share SL's opinion on the matter of bracing. On his site he states (on page 2, I believe it was) that a 3/4 inch thick wall should have an unsupported area of no greater than 4 inches square (by which I'm sure he means 4" X 4", not 4 square inches!). Danny at GR Research spaces his full panel (with large circular cut-out) braces 4 inches apart in his box for the GR 12" driver. What sayeth to that, ye all?