Just to add on - Strong little motors on them badboys... all things considered.
CV before 2000 (iirc) is more then worthwhile. After 2000 (iirc) their products have not impressed me.
Have you tried the IT series? I think they've been produced aft 2000 and I can telll you first hand that they are quite impressive in the correct sealed enclosure. Hell, I think they are still available now. I miss them from the mid 90s when the XL subs were everywhere. Remember Vanilla Ice? //content.invisioncic.com/y282845/emoticons/thumbsupwink.gif.129404938effda6ad9cca39e7f4b58a3.gif