Originally Posted by duc135
Here are some pictures of the bracing I use for my current build for a pair of 15" subs made from scrap pieces of 3/4" MDF. At close to full tilt at the limits of excursion, I can barely feel the cabinet walls vibrating while the floor and house are going nuts. My enclosure is 26" x 19" x 19" and the bracing adds only 4.5lbs.
Yes! I'm new to subwoofering, but most of the sub builds I've seen here look not only under-braced, but incorrectly braced. Bill Fitzmaurice probably has measurements proving how audible different wall thicknesses and bracing designs are, and his bracing scheme is a lot like yours, maybe just without as many "sticks", and with pieces sticking out on all sides rather than running along the wall itself (if that makes sense). Did you mean to say that your cab is 26 X 26 X 19? The structure appears to be 26" high, 26" and 19" in the other two planes. Other designers use more bracing than others, Jim Salk and Danny Richie, for instance. In the 50's the big speaker cabinets often had chambers filled with sand, a cheap way to damp cabinets. Also very effective, as well as heavy as h**l! My cabs are 18W X 24H X 24D and I braced like you, three rows of three left to right, two rows of three top to bottom, and two rows of three front to back. All connected where they cross each other. Maximum unbraced span 5.5" in every plane. About 0.5 cu.ft. of bracing, for a single 15. Walls 1.5", baffle 2.25". Overkill?Edited by BDP24 - 9/12/13 at 9:08am