Note that the program calcs the 5.5 ~95db SPL in half space, and this is without added room gain, which with the bigger BIBs is considerable. Note F7 is 30Hz. Note also how it can be EQ'd from the lower register right through into the treble region, at greater than 90db, more like 95db. Note also that if one subtractively EQ'd to ~90db, F3-30Hz. Interested yet?Thanks Eric for doing the thang.