Sounds like dual xs15se would probably do the trick, and it does fit within my budget nicely. I like the idea of having a smooth blanket of bass by going with two subs over a single. Though should I be concerned about the downward firing design over carpet? The room is over a crawl space if that matters.
Admittedly, I am also very enticed by the promise of deeper extension offered in the new S1500. I do realize it would cost more, just kinda debating internally. Besides price, are there any arguments for the older SE version over the newer ICE models?