I have a couple of Kappa15A's I'm going to build someday and was wondering if you use those drivers or the LF versions? Also, what size box are you using? The Kappa's don't go real low in a Pi sized box. I'm looking at a 6 cu. ft. box tuned to 40Hz for about 45Hz 3db point.
My Kappa 15LF's are running in 5 cuft boxes tuned to something like 37 Hz. I made them like two years ago so the memory is a bit fuzzy, they're also sold now.
The bottom end is quite solid on them. It leaves *just* a bit to be desired, but they are quite smooth and go quite deep. I've played some movies on them and they handle the low rumble surprisingly well.
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