^Oh, almost forgot to tell you guys. I acquired a pair of Euphonia MS4's for FR/L.
Here's "the good, the bad and the ugly" story.
The good: as expected, the SQ is excellent and slightly better, in detail, imaging, dynamics and soundstage than the Helis. And to my relief, as promised, the timbre matches from one Dali model line to another. So when in MC mode the Euphonias blend perfectly and seemlessly with the Helicon CC and surrounds. Visually they look better in my room though they don't have the "wow" factor of the heli deep gloss lacquer. The more sculpted lines and sloped tops blend right in and the satin cherry finish matches my satin finish cherry HT cabinet very nicely.
The bad: with my ears, room and electronics, there is no way the relatively small SQ difference between the Heli and Euphonia merits the huge price difference ( MSRP about $4K for Heli 400MKI vs$12K for MS4). The wife: "it sounds the same to me." This is a perfect ex. of the law of diminishing returns for $ spent on high-end gear. But then again, I certainly didn't pay retail.
This MS4 deal was irresistible.
The ugly-when I got them home and set them up, one speaker had a buzz/rattle sound when I ran freq sweeps. I eliminated the obvious such as a loose speaker wire connector or the screws holding the drivers to the cabinet. I zeroed in on the sound and it was one of the woofers!
My heart sank. These are very expensive to replace as they are sonically matched at the factory with the other drivers. It was rattling badly especially from about 100-300 Hz but I wasn't giving up yet. I carefully pulled the tweeter assembly out and took a look see. Nothing obvious. I reached in and after much delicate feeling around, to my relief I found that a speaker wire had shifted slightly during transport and the cone was rubbing lightly against it. Whew!
So all is well and I'm happy with the upgrade. And someone else will get the far better audiophile bargain that is the Heli400 MKI.