I wouldn't worry about VAS. The AE SBP15's vas is over 300L and its been reported in multiple posts on respected sites to be one of the best (if not the best) IB subs you can buy.
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Mobridge DA2 > JBL MS-8 > ARC XDi 600/4 > JBL Gti 408 Mids & Vifa OT19 Tweeters; PG Ti2 1600.5 > Morel HCW-10 & IDMax 15
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