I had two CVR 15, and am selling them because for my ears, they had bad SQ for certain music genres, such as some rock songs. If you are planning to hear to music like techno, rap, reggae and the like, the CVR will do incredibly fine, with great sound and SPL. However, don't expect the same from songs with many rapid notes, since these subwoofers don't blend very well. This is the only defect I found from these subwoofers after two years of use.
Also, I had the CVRs on a sealed box made with the kicker recommended measures and installed by experienced kicker technicians, including the best 7-band equalization possible for rock songs. So I think the best SQ was being propelled from them as well, but to no avail.