There is also an 8" but i can't open the pdf file to see it's frequency response.
The plot looks fugly.
Wonder why you can see one and not the other?
if you look at the scale of the measurment, it actually measures better than most Fostex fullrangers of equal SD and the resolution of the graph is MUCH better than the smoothed Fostex graphs gone over with ink freehand
As to other 'Boutique' FR's.....at least Dayton's giving you the off axis info, the question is why aren't they?