If you're going to use the double height space for audio (I happen to have high ceilings and love it) you could easily hide some sound absorption in the area where the plants are currently, and the flat surfaces above that. Thats a lot of surface area and can be covered with fabric covered fiberglass - same color as the walls for a more seamless look.
The other thing is (and I didn't see a pic of the ceiling) is to create some form of cloud up there. You could get super creative and build one that looks like a piece of sculpture, or perhaps imagine a large white curve on its side hanging down vertical from the ceiling. LED lighting could even be incorporated shooting up and down.
Most importantly find a solution for as many of the corners, in the entire house as you can. Even the tiny roomtunes triangle's I used to use, tamed the echo-slap type reverb in a loft space with high ceilings I used to have them in. (and that was with no rugs, upholstery or curtains!!!)
The corner trap can be fairly small in surface area (like 12" per side ) and still make a significant impact on the everyday acoustics for tv and conversations as well as music. I don't know who makes them that small today.
Theres a ton of windows so depending on what window treatment (if any) you choose, you may solve a lot of the problems. If you went with thicker curtains however, then I might consider adding diffusion.
In a space like that you may need extra bass so think about subs. It would be perfect for a huge distributed bass swarm.
The other thing is (and I didn't see a pic of the ceiling) is to create some form of cloud up there. You could get super creative and build one that looks like a piece of sculpture, or perhaps imagine a large white curve on its side hanging down vertical from the ceiling. LED lighting could even be incorporated shooting up and down.
Most importantly find a solution for as many of the corners, in the entire house as you can. Even the tiny roomtunes triangle's I used to use, tamed the echo-slap type reverb in a loft space with high ceilings I used to have them in. (and that was with no rugs, upholstery or curtains!!!)
The corner trap can be fairly small in surface area (like 12" per side ) and still make a significant impact on the everyday acoustics for tv and conversations as well as music. I don't know who makes them that small today.
Theres a ton of windows so depending on what window treatment (if any) you choose, you may solve a lot of the problems. If you went with thicker curtains however, then I might consider adding diffusion.
In a space like that you may need extra bass so think about subs. It would be perfect for a huge distributed bass swarm.