the smoothest sounding speaker

Thanks fro the suggestions. I forgot about Spendor. Roman Audio looks interesting but their site:

http://www.romanaudio.com/

does not work.

Ozzy, tell me about it. I am also looking into Dynaudio MC15 active speakers too. They use A/b amps. No Flying Mole digital stuff. Then all I would need is to build a dual mono motorized Alps pot volume control. The Marantz CDP is sort of harsh although really good for the $$$. Such a bummer the Sony SRP-P50 is no longer available. I also like the Creek A50r. Can't find those either.
I have built a variety of single driver speakers and even though they are fairly low resolution they are still harsh. That's because of the breakup modes, typically at 6 and 12kHz. No wonder people don't design these drivers into speakers to run full range, even though the driver can do it.

Here's one When the drivers like this have incredibly low distortion, and the design is well implemented, you get a non-fatiguing "listen all day" type of sound

I think (as of today) driver distortion is my biggest detterent to enjoying the music. I can live without all the detail, bass, or treble, but if distortion is high.....no way.

and the kit ZRT

How about Ohm Walsh micro talls or Eggleston?