OK, here is my dilema. I have martin logans and really am into music. From Snoop, Diana Krall, Limp Bizkit, Miles and many more. I really listen to all sorts of stuff. At the moment, I have the money to buy a new sub. I am really torn between the Vellodyne HGS-12 and the HGS18. You see, I can get the 18 used for about $1400 in perfect condition. The HGS-12 sells for $1400 new. My room is not too big. I just don't want to miss out on an awsome deal because of lack of knowlege. My questions is, Can an 18driver be as tight as a smaller 10" or 12" driver. Will it be fast enough for Martin Logans? I personally don't know much about the SVS lineup and tried PM one of the guys that works there but didn't get a reply. Any info will help. Thanks.