You should be very careful with the amount of power you'll have availible to these woofers. The 8100d benchs in the 1300 watt range into 2 ohm mono, which could very well put a hurting on the 8k 12"s. The woofers have a tinsel lead problem, and could very well snap apart in high excursion...
Thats definitely true, I've seen anywhere in the 1100's to 1200's on the birthsheet. So you could be overpowering by as much as 200 wRMS per sub. Can it be done, yes of course, but I think the quality of their subs are starting to decline slightly. Maybe it's because they set high expectations or whatever, but they aren't as reliable as they were a few years ago. A while back I was thinking about going with 2 8100D's to power 4-12" 8000's, the model that handled 500wRMS, I've seen a few setups similiar, but I haven't heard or seen anyone with the newer 400Wrms, running off the 8100. You can try it, but be very very careful. You'll want to start off with the gains all the way down, sealed box, 1/0 is what they recommend that is what I would go for (you already spent big bucks on everything else, no need to short change the wire), you can kinda get a feel when your sub is close to it's limits. By all means, if you can get your money back for that amp or exchange it for another, that would be best.
