In-ceiling Polk speaker in the kitchen. I have a Wiim Pro Plus in front of the Fosi. I have the 32V power supply. You would probably want the 48V.
I suggest simply shopping price and features from the green section of Amirm's list. I assume the Fosi is near the top for price/performance.
I don't know if sibilants is placement depedent. I hear it sitting in the ideal position with the speakers square to the room (10-15 degrees off access?). But I don't hear it often, and I only hear it when the mic is obviously near clipping. It's just like hearing sibilants in a live performance...
I hear sibilants occasionally with the R3 Meta, especially from from female vocals. It may be in the recording. I find the problem worth it for the detail the R3 provides in some instruments. I'm very pleased with these speakers.
I do use Dirac Live. There is a very significant difference...
Just buy a Wiim Pro Plus and put it in front of the Buckeye. There a huge amount of software development in the Wiims. Taking it further use Roon with the Wiim as an endpoint.
I find the above a better value and more sophisticated than BlueOS. I have a Node 2i.
True for true audiophiles. But high end speakers in very expensive houses are almost never near the power amps. I find it disappointing that more speakers don't have balanced connectors. But I assume the fancypants $15K speakers do usually have balanced.
I like how the Chinese designed products...
How I would spend a $1500 budget:
Wiim mini or Wiim pro using digital out on each. No need for the Wiim Pro Plus as the DAC isn't used
miniDSP Flex + Dirac + UMIK-1 microphone. Plus a cheap full size microphone stand from amazon
Buckeye Hypex NC252MP (250W)
I like the value of the above. Plus...