This is kind of what I expected, but I am surprised how close I am getting from my current setup so figured it'd be worth asking. I repurposed my old HT speakers the Elemental Designs EDC6's with the DE250 compression driver. While I'm waiting on my Buckeye amp to arrive I am driving them with a cheap Fosi amp and without cranking the gains I am hitting low 90s at 15ft, after DIRAC calibration. But in fairness, the elemental designs are a 93db sensitivity compression driver design, so....extremely efficient. I can honestly probably be satisfied with the same volume level (low-mid 90s) at 15ft if it means getting a really nice dual use system.
Excuse the mess since I am still building the room (waiting on GIK Acoustics order to arrive plus a bunch of electronics), but hoping to make it a triple use room - recording, live parlor concerts, and 2 channel listening. I am excited to see what a ceiling cloud and diffusion on the brick/freestanding in front of the glass does to the sound of both the piano and the speakers. Even with the carpet the room is pretty reverberant.
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Wow... That room screams acoustic nightmare to me!
Good luck getting that beast tamed.
I'm almost more confused now in how you will be using the room and your plans on setting up the audio system and how you will be using it.
Regardless, a 93db rated Speaker has a serious advantage over even just a true 90dB rated Speaker, requiring half the Power as the 90dB one to reach those peaks at full distance.
Admittedly, I don't know Perlisten first hand, but I still think you would want to be looking at a much more specific design goal from a Speaker Manufacturer than what Dennis at Philharmonic or the crew from Perlisten had in mind. That's just my 2¢.
I think you can indeed find a single use system that will do what you want, but you may just need to shift your focus. In that room, the Perlistens will likely be a better fit than something that is such a Wide Dispersion Speaker as Dennis' designs are. While the HT will fill the room with sound, you have so many hard and reflective surfaces that will be interacting with that widely dispersed energy.
That said, if you changed your layout some, you may be able to use the HTs to better advantage...
However, I don't know how well they would support the possibility that they would be used as live accompaniment to a Piano performance... even if it were only you in the room.
The same is often said about people that want to do karaoke with their AVR. *shrugs... Yes you can, but it's not really the right tool for the job.