If you can mess with your w/l ratio you could do sonotube. Large diameter 12" deep. No bracing required.
PS- congrats on your four subs. !!
FS- Netgear 550 .ISO player - PM me
My Gear-Pioneer, JBL Pro Cinema, Fi Car Audio 4- SP4 18", Peavey IPR2 7500 x 4 -Mini-Dsp 4x10, GIK Acoustics, Seymour Screens 110" AT, Dune Smarts, uNraid Server
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