NC502 from whichever assembler you prefer. Why?
NC252/502 are the cleanest amps on the list (unless CDA made big strides with the GaN). Sure, the audible differences are tiny at best, but Ncore does basically nothing wrong, ever. For example, you still won't hear hiss if you switch to more...
Dunlavy SC-IVs set up on long wall in 13'x18' room, playing CG's & @John Atkinson's Fairfield Four recommendation. After hearing a few tracks in 100% audio room with 1x damping panel, listening to 6' towers, asks, "Where are the speakers?"
Okay, but is that high compared to Dutch, Genelec, & Kii? I'd say it might be a bargain.
@Tom Danley, 28Hz and 100dB and 2.5cuft and CD? Please share any hints you can, because that's seriously impressive.
You have a large pizza - 16" diameter. But suppose a friend shows up to share it. Then 2 of that guy's friends show up, so each person gets 1/4. When this happens 13 times, your piece of pizza is 1/8" x 1/8", and you have 8192 people sharing the whole thing.
Remember that regular people simply don't grok BIG numbers. The most important thing is to keep it dead simple. And you'll want a visual aid.
Go to the convenience store.
Read label to note that a single Twinkie is ~40g. Or trust Wikipedia, as I just did.
Remember the visual...
Or, use wide-dispersion speakers, then move freestanding panels near them when you want more focused sound. 4x 4" panels would massively reduce off-axis output above transition, and they'd cost under $1k.