MK, no harm meant but I thought we just had a discussion about the S2 and its ability on the sub ownership thread. Quoting you,
"That is what I have been saying. A Cap S2 can play loud above 20hz and duals would certainly be able to play reference and beyond above 20hz as well. I mean if dual Cap S2s can play 133 dBs already why get dual OS to play 139 dBs? I will use my room as an example because I know my room gain profile which adds to any sub. Say an OS can hit 133 dBs from 20hz and up. At 10 hz I will be able to hit 121 dBs. Now a CapS2 can hit 127 dBs from 20hz and up and hit 127 dBs at 10hz! Now both subs can hit reference in my room but the sealed cap is much smaller and have headroom throughout the band, the OS will only have headroom above 20hz. Reference level bass with redirected bass will ask for over 121 dBs from time to time so the OS may not always provide what I need at the lower frequencies where the CapS2 will. That extra headroom will never be used over 20hz. The room gain one gets is not as important as your goals because no matter what more displacement is needed down low and even outside sealed subs will play under 12hz louder. If one wants to play 130 dBs of music then the OS is the obvious choice because it can do it!
Were you talking strictly with your room gain capabilities or something else. I thought we were talking outdoor measurements here. Were we not?