Speaker choice, help please.

Khokugo there's one pair of Bob Brines FTA-2000s in New York city.Audiogon member Bemopti123 (AKA Paul) owns them.
He may give you a listen. Do a members search and email him. He's a nice fellow. FYI there's only four pairs of this speaker in the world built by Mr.Brines and one is close enough for you to get a listen.

Good luck!

Khokugo
As far as the sub question goes. It depends on your taste.Some of these single drivers benefit from the addition of a subwoofer or subwoofers. There are a few that work well without a sub. The Bob Brines FT-2000s get down around 30 Hz. The FTA-2000's are also spec to do the same. From living with these speakers I've concluded they go lower than what the specs say. I'm getting into the 20 Hz range without boom in my room with single drivers. The room loading is different from room to room.So your results may vary. The Jordan TL may be your best bet mated with a sub.

I couldn't say it any better than Array1138. It sure sounds like your headed towards the single drivers! I never heard the PHY-Hp ...but would love too. Very high quality drivers no doubt!

If budgets not a concern .You have a host of great single driver speakers out there that will do exactly what you want. Given the distance from the rear wall .You probably need a speaker cabinet that vents to the front or side.

I also have spent much time listening to Sonus Faber. Very easy to listen too speaker. But a crossoverless single driver will make them sound like you threw a blanket over them. There's so much more info delivered from the midrange in this type of speaker IMHO. Strings have a electrostatic quality..very fast and immediate. Also don't get caught up on just the dealer network wide range speakers.There's plenty of smaller companies that give you more of what you pay for. Here's a few links to get you started.

Good luck!

ZHorns. The JORDAN JX92S driver TL maybe a speaker to look at or the zHorn Heruka uses the Fostex FE 168 E Sigma driver, a 6.5 inch driver.

Carolina Audio. Basically the same Jordan driver implementation..different company.

Brines Acoustics. Maybe a LT-2000 or the FT-1600 MK2 if you want to eliminate the subwoofer in the system.

The Horne Shoppe. If you want to go with the corner loaded approach.This maybe the speaker.

As I said plenty more ..this is just a start! The good thing about some of these companies is a money back guarantee..try before you truly buy.

Array1138
I was just checking out your speakers Cellia ! Man those are lovely!! The Calliope.30 looks like a force to be reckon with as well. When you get tired of them..hit me up.:-)

Good listening!

Ken my speakers are 8ft apart..no problems. I've listened to 5 inch single drivers that were 10ft apart..no gaps.LOL
You have nothing to worry about in that area.You would be surprised with how wide the stage can be with some 4 inch drivers..probably amazed .If you haven't experienced it before , your in for a shocker!!

Infact you'll spend several days trying to figure out how the designer got so much sound out of one driver. I find it quite amazing ...that's why I'm constantly looking for and reading about the designs of these speakers.

I figured the FTAs would be too big. It was more for field trip experience.So you can get an idea of how some of these different implementations using a wide range driver sound.

BLH or backloaded horns have their strengths. They play a little louder before compression than the Transmission line designs.The BLH is also more efficient. The TL's are not as efficient but have much better low end response.In order to get the same low end response the BLH cabinets must be huge.

In your and my position the TL is where it's at. The cabinets aren't overly large but don't sacrifice low end grunt.As you look through the different types. Look up the prices on some of these drivers.You will quickly realize that a good portion of the cost of some of these speakers. Is attributed to the very high grade expensive drivers some of them use. We're talking $3000 just for a pair of drivers!!

Here's a good site to give you more to think about Full-range Driver & Loudspeaker Theory.