+1 for GIK Acoustics.
Also, sculpture can act as diffusors. :)
If possible, remove the glass or replace with museum quality plexiglass which maintains UV protection but is less rigid, and not as good a reflector. Also, use foam behind the frames to prevent rattling from the drywall.
Avoid reflectors most of all at 1st reflection points. However, you can compensate for too much glass somewhat with lots of diffusors and dampening elsewhere. For instance, the ceiling is often overlooked. :)
Best,
Erik
Also, sculpture can act as diffusors. :)
If possible, remove the glass or replace with museum quality plexiglass which maintains UV protection but is less rigid, and not as good a reflector. Also, use foam behind the frames to prevent rattling from the drywall.
Avoid reflectors most of all at 1st reflection points. However, you can compensate for too much glass somewhat with lots of diffusors and dampening elsewhere. For instance, the ceiling is often overlooked. :)
Best,
Erik