I don't have any info on the newer stuff either, but I have a pair of FA CSS200 THX 12" subs. They're passive, and they're heavy beasts. I kept them in my system for "LFE only" after I upgraded to JBL Performance Series speakers, which included a pair of PS1400 (14", 400W) powered subs.
The CSS200s need at least a couple hundred Watts to get them really working well. I'm driving them with 215W/ch, so they're responsive, but I think 250 or more Watts would be better. The reason that I'm noting this is that the 15" sub you see on the Internet has a 200 Watt amp, and that seems light to me.
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