Never, ever, owned one, except attached to my PC speakers. Ill be picking-up my new Kef iQ9s (Possibly iQ6c and iQ8ds at the same time!), and will be running these through a Pioneer AX5Ai, in a room, 5.4m x 4.4m. This will be used for music and movies, which I like to listen to loud, when given the opportunity, and want a Sub that will destroy any thoughts of an upgrade for some years to come. My reading points me in the direction of a SVS, but which one, cylinder or box type, is there others I should consider? Im setting the budget somewhere in the £500 region, but if I should be aiming higher, Ill prefer to wait for more funds then fall short of the mark. Whats your opinion please?