Sweet.Don't worry i wasn't looking for spl, specialy with the cone area downgrade.I'm more than impress with the output, i wasn't expecting them to be that loud, in such low end bass tracks.
I'll check what they can hit at 20hz with a lot of care. My ad's were doing 132.
If the really low stuff is of interest to you at high output (18hz to 25hz), you can go as large as 5cu.ft tuned to 22hz. At that point you may find you no longer need the SSF. Excursion and will be a factor in the mid to upper 30's for that setup.
And don't listen to people who tell you there's no music down that low. I have recordings, rap and otherwise that have frequencies as low as 7hz. There's some good fun to be had between 15hz and 18hz.
