actually there pretty nice subs imo, only kicker really worth buying but a tad overpriced. every once in awhile i've seen sonicelectronix.com have them on sale under $200 for a 12", and that's bnib and from a kicker dealer. in spl, alot better than the cvr. sq, i'd say about the same. it's basically a round l7, and yes, in a good install it'll get just as loud/louder than an l7 with better sq.
i have two cvr's right now, if i bought two cvx's would there be a pretty big difference in spl?? and are they worth buying if i already own cvr's? i can get them for about 155 shipped on ebay apiece.