JRS
Major Contributor
I have only built the Kairos. It is an outstanding speaker. The build was for a friend, but before it left home I took the opportunity to measure the drivers and implement a biamped/DSP'ed version of the same. It was a question that had been kicking around in my mind for a while as to whether a really well done passive XO could be improved upon (or even equaled--that being the POV of many who prefer analog vs digital XO's.)How do you like the Kairos/Adelphos? Always wanted to build one.
I made no effort to target the FR of the analog version, but just aimed for flat as I could make it. (The analog version was perhaps +/- 2 from 50 upwards anyway). I could not A/B instantly as there was wiring of the XO to deal with. In any event I couldn't pick a clear "winner"--whatever differences were minor. I consider that testimony to how good the design was, and posted over at Tech Talk to that effect, congratulating Jeff for a job very well done. As always he was most gracious, though I believe he was surprised, and perhaps even a wee bit skeptical that the active was as good. Whereas I of course held the opposite view.
It has a fine bass response as is, but if one wanted to kick up their heels, the strain on the little 7" Satori would become evident with LF heavy material. I believe that would be a helluva system for the price.
Edit: One thing I forgot to mention is that Jeff used a first order XO in keeping with the goal of exceptional phase response while I used 96dB/octave linear phase FIR filters.