the cvts can get very loud in the right box. i've done them in both sealed and ported, and have yet to hear them fail. they are a bit deeper then most shallows though.
the pioneers flat out **** in every box. sound more like midranges then subs.
clarion has a decent shallow mount has well, was very impressed with it. not the best one out there, and a bit pricey, bu tnot bad.
and then there is SI. while i've not gotten to listen to any of their new products, if they are anything like the previous gen, whoa! they'll be good!
wheeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee //content.invisioncic.com/y282845/emoticons/peace.gif.2db28b618ed8d1964ebbe2f5021d2c39.gif