I currently have a 10" B&W subwoofer which I am fairly satisfied with but I just can't seem to get it set-up right. When i run the test tones on Avia I get big dips in the frequency response(6 dbs or so), because of this and the need to always have bigger and better I have been considering a shiva or av-12 sub. Now I would like to keep it as small as possible but size isn't a major issue. The sub will be used 90% HT. Been considering a pr because i beleive they are smaller because of no need for a port. Was interested in opinions on the 2 drivers as well as what alignment you guys feel would be best. My room is 11'x18'with 8' ceilings and no major openings to other rooms. Any ideas on how to properly set-up my current sub until i can build a new one would be appreciated as well.