The "room" is a dedicated space but not really a dedicated room. One-half of the left side of the space (towards the rear wall) is open to the kitchen, and one-third of the right side of the space (towards the rear wall) is open to the equipment room. Finally, an asymmetrical ceiling soffit steps down above the left rear side of the room.
The walls of the room are what they are (some concrete and some drywall) so I do not conceive of the project as "designing" the room in the sense of building a "room within a room" or ceiling resonators or bass traps or other structural audiophile improvements. I am not do anything structurally to the walls of the room. It is just a matter of fixing drywall and painting the walls. This is in no way a purpose-built room like MikeL or Marty designed.
I had a fully-functioning stereo (also with dipole speakers) in this room with only some carpet and some ASC Tube Traps and Tower Slims, and I was happy with the sound. I think 14 foot ceilings help a lot.
Steve's and Bob Vin's acoustician, Bonnie Schnitta, will be measuring and making recommendations.
Acoustically necessary or not I would like a movable drapes arrangement on the side walls and the rear wall to create the contour of a rectangle to delineate visually the four "walls" of a room.
I also still have the ASC Tube Traps and Tower Slims to play with over time.
Gryphon does not make recommendations about acousticians. Flemming starts with the "Rule of Thirds." The main Gryphon listening room is not heavily treated with acoustics products.
I have had the exact same stereo system in three different rooms over 18 years. This space sounded the best by far of the three spaces. Not surprisingly it is the biggest of the three spaces. I feel like I have had a lot of experience with dipole speakers, since I have had only dipole speakers since 1988. I am very confident I will be able to achieve sound that I, personally, will be happy with.
I'm reasonably confident that with Bonnie's assistance we can realize at least three-quarters or so of the potential of the 19.5' wide, 24.5' long and 14' high space. To realize the rest of the potential of the room and to maximize sound quality I will look forward to analyses and suggestions from our members here who visit me. (David and Marty and MikeL, among others, have the patience to move the speakers an 1/8" and then reassess carefully the sound. I do not naturally have that kind of patience. Hint, hint
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There is one line of thought that even suggests that large openings in a listening room can be helpful in releasing excess bass pressure.