Pro Audio Technology speakers

It sounds like a good bet to me. I never heard of them, but reading the "About Us" section, the company is headed by Paul Hales, formerly of Hales Design Group. Hales Speakers are still used and loved by some audiophiles.
All of the speakers look pretty heavy duty. I liked the looks of the SCR 2215sm because it looks like the speakers that I use and love. It’s probably better.
If you’re looking at these, you might also check out JTR speakers.
Good Luck.
By the way, response down to 20 hz sounds petty good to me.

In wall AV loudspeakers might be a little outside the knowledge base of most here on an audio forum. Not sure what forum you might seek out but a group that deals in AV stuff. 

Thank you both for your thoughts.

The SCR-2215sm does indeed look like a beast! I am aware of the Hales pedigree, which makes me feel somewhat better. I will look into JTR, too. re: the sub response, units like the SVS PB16 Ultra claim response +/- 3 dB down to 13 Hz...supposedly that very low response is an important part of the "feel" of the sub.

Russ, fair point. This forum has already provided me such excellent info on other topics that I wanted to get any input from the folks here. I find the quality of discussion to be a bit better than elsewhere. But I will look for other places to post as well.

Your installer is right on the money this along with procella is the best for building a true theater

@audiotroy -- yeah, from what I've been reading, I'm pretty sure this would be a great theater system, although I'm not sure how I feel about the tight coupling of the speakers with their DSP amps and the bi/tri/quad-amping. I'm less certain how suitable the system will be for music only applications. Any thoughts on that? I would not say I'm a super-critical listener, but I do want to make sure music sounds great.

@txavgut --

The system will be used 50/50 for movies and music. [...] the subs (LFC-15sm) don’t seem especially impressive, claiming response only down to 20Hz. But I realize specs aren’t everything.

If used 50/50 for movies and music a 20Hz hard deck might be a very appropriate compromise. A lower tune affects bass presentation, and while depth-wise it will reveal infrasonic information found on the source material from select Blu-ray and 4K UHD titles, it also has impact on the central to upper bass character and therefor potentially, depending on the chosen cross-over frequency, the integration with the main speakers.

I like crossing over to the mains fairly high (~85Hz), while not least high-passing the main speakers at the same frequency to relieve them from the lower to central bass, which then cleans up their upper bass to lower midrange and adds further headroom. Similarly, if one would, I prefer not to run the midrange/HF horn + compression driver down to their lowest (professionally) recommended cross-over frequency, but just enough above it (with high-order slopes) to clean up the sound bit and aid energy-coherency (that’s the term again - energy coherency: in combination with phase and timing behavior it’s vital for music reproduction to create a smooth sphere or "radiation bubble" of sound in front of you).

Honest 20-ish Hz extension at close to war volume, still effortlessly reproduced, is something that won’t be easily forgotten, and makes sub 20Hz extension that’s any less capably reproduced (i.e.: that takes loads of displacement area, btw.) seem kind of blah and not worth it. Just my $0.02..

If you have the income, give them a listen first. 
May be a bit harsh in the treble.....

@phusis Incredibly helpful and interesting info -- thanks. As I've been learning more, it has become even more apparent that system tuning and configuration is very important, and raw specs are not sufficient to understand a system's overall character.

As @arcticdeth said, I really need to find a way to listen to these. Interesting, several systems that have been recommended to me seem to come with concerns about brightness/harsh treble.

@txavguy --

... Interesting, several systems that have been recommended to me seem to come with concerns about brightness/harsh treble.

Aaand it's a common misconception not only on this forum but audiophilia in general - this notion that speakers comprising compression drivers and waveguides/horns to load them will necessarily or certainly be more inclined to sound shrill, harsh, or other adjectives of similar meaning.

One of the reasons I started becoming more interested in waveguides, horns and compression drivers was to avoid the following: direct radiating dome tweeters. I've heard my bad/badly implemented share of them, and they're the one driver principle in particular that's potentially annoyed the hell out of me. A good compression driver mounted to a fitting horn/waveguide, and there are many examples of that, to my ears sounds less like a "tweeter" and more like a natural extension of the lower frequency spectrum. As such it's more naturally "ignited," effortless and has better substance and energy to its presentation.

Direct radiating dome tweeters by comparison generally sound thinner, more overtly (but unnaturally) detailed, and not least more strained. Indeed, if anything it's dome tweeters that has, to my ears, fitted the "bright/harsh" description most closely (by virtue perhaps of being rather malnourished sounding). 

In short: I wouldn't worry about speakers using quality and well implemented compression drivers and horns/waveguides, on the contrary. 

phusis,
I agree with you.

@phusis I really appreciate your thoughts, and your description makes a lot of sense. The description in your second to last paragraph ("Direct radiating...") aligns with what I've heard about the Paradigm Personas. I am excited to hear some of these speakers for myself and to draw my own conclusions.