Well I have written up my own experience in building and evaluating the Abbey kit from Dr. Geddes.
Here is a picture of these speakers in a temporary setup. My plan when moving to this speaker was to change to an acoustically transparent screen. Current room setup prohibits moving things around for the center, for now, so just know, I know its poorly setup, it will change in the future.
A bit about my setup:
Processor: Boston Acoustics AVP7 Pre-Pro modified with LM4562 opamps and panasonic FC caps (received all as free samples) or surplus stock.
Amplifiers: Acurus A200, DIY based on AussieAmps modules LSP-400's and NX-150s (My own CLC power supply design similar to Cello amps).
Sources: PS3, Oppo DV983H, Toshiba HD-A35 and HD-A1, Acoustic Solid Turntable, Musical Fidelty X-LP heavily modified.
Projector-Sony VPL-VW40 and Yamaha LPX-510
Screen: 100" 16:9 motorized retractable with surface painted with gray high contrast paint mixed with metal powder and retro-reflective beads (soon to change).
Speakers: Jm Labs Electra 905's, Matching Electra Center, Diy M&K Tripole Clone using surplus cabinets and tweeters, DIY Subwoofers (Currently 2, but mains speakers are now run full range), DIY Focal speakers, DIY Dynaudio speakers, and now Gedlee Summa Abbey.
Here are some assembly pictures I took along the way:
As for a review of the Sound Quality:
Well let me first say that after listening to a lot of different speakers in my own system over the years, going to lots of different theaters, hearing lots of different professionally installed theaters, the one thing I found was that very few could reproduce the scale of movies or music. Often it was difficult to know when rock recordings, but live acoustic recordings of jazz and classical, especially things I was familiar with live, were simply incorrectly scaled by most all speakers I had heard. While I think there are a lot of things which contribute to realistically reproducing a performance, one of the major ones that most speakers seemed incapable of doing was live performance levels and dynamic range. I think this is even more important in movies, as the dynamic range really needs to go from ambient noise floor levels to full on explosions. However I recently noted some research stating that the dynamic range of musical performances is much greater than previously stated (25-45db's was the old view, some now argue it's more than 60). While I have no delusions of reproducing 60 db's of dynamic range, I wanted at least 25db's with no driver compression distortions over a very wide frequency range. This means that I need a speaker that goes from my noise floor to at least 25db's. If my noise floor is 65db's, then I want 90db's with zero compression. What I really was hoping for though was more realistic ranges, like 40db's, and realizing that my noise floor often is closer to 70db's, that meant peak output in the 110db range. My experience has been that no speaker I have heard can cleanly reproduce 110db's with suitably low driver compression over a very wide frequency range. Dr. Geddes seems to share my view that few if any speakers made could handle realistic dynamic range, and those that could, sounded bad in other ways. I still wanted a disappearing act from the speakers for staging, with accurate size, scale, and placement. I wanted natural tonal balance, no horn honk, no perceptible coloration's, etc. There are speakers that can do some of these things, maybe even some that can do all of these things, but none I can afford. Then add in the room acoustics issue, and value in controlled directivity over a very wide range, and I believe there really are almost no speakers on the market that fit the bill. JBL and Klipsch have speakers that I feel fit the bill in some ways, but the ones that didn't sound overly colored were too expensive, and really still weren't exactly what I wanted.
Did the Abbey's fully fit the bill? I think so, I've not lived with these as long as other speakers, but they do things no other speaker I have heard can do. They do seem to produce a convincing sounstage of accurate size, scale, placement, etc. The speakers mostly seem to disappear, but I also have a compromised placement with lots of diffracting objects around the speakers. They don't sound colored to me at all, and my frequency response measurements do indicate a smooth relatively flat response in room. They don't sound like typical waveguide or horn loaded speakers, a big fear I had. They play very loud with no audible compression at any level I should be listening at. In fact, I find myself listening at louder levels than I normally do because for the first time, I can listen to movies and music and not be irritated by distortions caused by overloading drivers.
Oh yeah, for acoustic treatment I use panels I bought from ATC on the front wall behind the speakers, and a few more panels I made in a few other locations where I had strange reflections. I have diffusers I made on the rear wall, but plan on adding more and maybe better diffusers. I have no bass traps at the moment because the ones I tried had no appreciable or even measurable effect on my bass performance (The Geddes or Harmon approach to subwoofer setup is much more effective). I do plan on building some tuned traps when I have time.