Craig - somewhere on Outlaw's site (can't seem to find it right now) they make a claim that 2 LFM-1's provide a performance advantage by creating a larger sweet spot. Of course, that could just be marketing speak in order to sell more subs, but they do offer a great deal on 2 LFM-1's for $999.

Have you ever tested or just played around with a 2 sub configuration? Curious as to whether there is any truth to their claim, or if there would be any other reasons to use or avoid using 2 subs together. thanks!