best 12 subs for small sealed boxes?

Thanks, I've heard good things about those subs, 2 different sites have different power handling ratings on the ID12's. should be 400 continous but can they handle more on a continous level? I've heard that the tonal clarity is rediculous. I listen to R&B and rap but really like musical bass tones so I need to go hear them in person.

Yes it ok to build out of spec. I have learned a lot of manufatures specs are great starting points and for most decent enough sound. I should ask how long have been using the d3's, as they will eventulay become worn. By the way I usually run the the d1's and d'3 in a 1.5 cu. ft per sub enclosure, they drop pretty low. I have also experiment with slot ported eclosures with the diamonds. We made a couple that took a bit to get what the customer wanted tun-ing wise. Recently I ordered a pre-fab from audio enhancers and it hits really low, maybe hit them up for some exact tuning specs. The big draw back to it was, it cost a fortune to ship @ 75lbs. And yes it is made for diamond subs specifically. I am sure the tc sounds are really good also. I see they get high marks from other members, I just have been  impressed with diamonds quality and it not just because I sell them either. Hope this helps. If you wish to drop really low maybe a D9 15".