Hi CDC,
Just arrived today - ditto to Ingvar's comments.
Right now I am starting them off with in my work office with dual Pathos amps (in bridged mode) with a REL handling above 75Hz. Out of the box, the sound is very, very nice indeed. It seems like the sound has changed a bit over the first few hours with the drivers seeming to be a little bit faster - surely this will continue to change after a few more hours or so.
Just now listening to Josh Grodin's "You are loved", I am blown away by how these tiny speakers can image and easily handle complicated passages. The soundstage is simply massive. Strings, pianos, acoustics guitar are rendered beautifully and sound true to life. Hard to believe all that sound comes out of a 4" driver and a Murata super tweeter!?!? Very natural sounding and super easy to listen to. Highs are extended and sweet but not at all rolled off.
One thing is for certain though, if you intend to listen to music that contains any significant information in the lower octaves, a subwoofer is a must.
Size for me was an issue - but in a good way, as these are intended for my home office where I've been wanting to go with a smaller speaker but have been waiting for just the right one. Getting hooked on the single driver sound of my Zu Tones, these seemed to fit the bill perfectly. An added bonus is that they match the decor of that room perfectly.
In keeping with Ingvar's amp comments, my gut feeling is that the Kotaros will do well with any one of the Almarro amps. At this point am leaning heavily towards the Almarro 318B or perhaps a Melody I2A3. Good thing is that the both are carried by the same dealer and the Kotaros are so small I can take them there to audition.
In summary . . . Micropure = Macrosound.
Hope this helps.
Cheers,
Garry