I will be building one or two "few holds barred" subs later this summer and wanted opinions on drivers. I have been leaning towards the Mass 2012's (or maybe the newer 3012's when they are available), but since the preorders for Stryke HE15's is tomorrow, I need to sort of make this decision now. The price difference is not really an issue, but enclosure size is somewhat. Since the Stryke is a larger driver, its enclosures will be larger, but what would using it get me over the Mass drivers? I am looking to make real "bottom feeders", tuned flat to 16 or maybe 14 Hz. SPLs are third priority after flat response and low tuning. Room is not huge, 15Wx35LX9H, with some doorway openings to other rooms/stairway. I'm rarely going to be at reference levels, and the sub(s) will be handling the LFE and bass from surrounds and rears in a 7.1, or sometimes augmenting 2 channel music (50/50 useage). I will make either one dual driver sub (I know twice as large) or if it is just to huge in meeting all my goals, then 2 single driver units. Anything over a 24" sonotube 6 feet high will probably begin to attract my wife's attention. Advice? Thanks! This is all unless I miraculously find the $2800 or so I would need to buy a pair of SVS CS Ultras lying in the gutter. BB "Yes, a joke. Come, we will laugh in the car."