I am intrigued by the high efficiency speakers - direct drive from DAC concept. I have found a guinea pig willing to let me try that on his 112dB sensitivity horns. Will report back on that.
Sounds like you'll need a Chord DAVE to drive those speakers Emile
There are always tonal challenges with single driver speakers, which some people can not overcome. For me, I found that my brain very quickly recalibrated itself to tonal challenges (first on Omega Super Alnico Monitors, then my Voxativ 9.87's with 4D drivers), but that sense of holographic immersion and transparency was something that tapped into my brain like a dose of musical crack.
Very much looking forward to hearing what you hear (the speed and dynamics of Extreme with those horns will be something to hear!)