Tuxedocivic was correct about that speaker. But I think the higher crossover might have originally been intended for more power handling and high volumes.
The Karma-10 started with me experimenting on pre designed crossovers and switching out parts to get a better sounding speaker. This was back before the SEOS design was even done. The crossover layout was similar to a well known commercial theater speaker that had been discontinued a while ago, but happen to use nice components. I actually started to build these speakers in my home theater before the SEOS.
Later Bwaslo showed me how to use his Omni-Mic. So I looked at the frequency responses of the completed speakers and noticed that where the original compression driver dropped off or had issues, the new DNA-205 didn't. Plus they had the same efficiency, and the DNA-205 also had a smoother sound. So I thought, what the heck, let's switch the compression driver, and the waveguide, recess things differently and remeasure. Oddly enough, it tested better than the original and sounded nicer.
So I took the completed 'Frankenstein' speaker to Bwaslo and he worked to smooth out a couple small spikes/dips with some slight value changes. In the end, he said the speaker had 'linear phase'......(or something like that.) It was kind of a luck shot of me fiddling with parts to make them work for my own project, and then Bill doing some extra magic to make sure it all went okay.
It turned out to be the cheapest 10" speaker model......so it became the Karma-10.
Eventually I'll get some surround flat packs made up, but I have no idea what the angles should be. If someone could draw up a 1cuft surround speaker, I would get them done.