hi curt, i wouldn't trade *two* f-1500's for my sub system, which consists of a pair of vmps larger subs, 2 bridged adcom gfa555's, & a deluxe marchand xm9 24db/octave x-over. i have yet to hear *any* sub system, w/the exception of the subs on the infinity irs 5's, that come anywhere *close* to the clean, tuneful, deep bass i get outta my system. even the 18" velodynes sounded muddy in comparison to my sub system. as far as using only one sub, unless it's a *really* small room, it *will* degrade the soundstage, no matter how well it's placed. one person's opinion... doug
