Are you still into monster subs? If so, check out the 12π basshorn subwoofer. I'm really proud of this design - I don't know of any commercially available subwoofer that can top it in SPL or low-distortion sound quality from 30Hz to 100Hz.

About your sale, you might want to list this stuff in the Swap Meet forum.

As I recall, the Kappa 15 is compatible with the Omega 15 in that most designs can use them interchangeably with respect to tuning. But I don't know about the Kappa 15LF, either with respect to tuning or upper frequency extension. I do know that the Delta 15 is very different, so I would probably look at designs that use the Omega 15 as a starting point, if someone were to consider using the Kappa as a drop-in replacement.

The horn used in most of my speakers is the H290. The H395 isn't going to work in any of my designs. Your price is reasonable though, and I'm sure they'll find a good home.

Seems like the Peerless woofers and North Creek tweeters would make a great little two-way system. I'll bet those sound sweet.