I'm not sure a single 12 will give you the output you want. From everything I've read, a single 15 is enough for SQ guys, but SPL lovers need at least two 15s or more.
Given those two drivers, the W7 reportedly works great IB, but I would still give the edge to the FI since it is specifically designed for that application and it has excellent reviews. Also take a look at AE SBP12 and SBP15. Supposedly one of the best IB drivers. Those however have a 4-6 week lead time.
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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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