I own Cremonas.
Your plan - app 30 X 20 feet - is a pretty good size, but I was advised that a 1.5 to 1 ratio in length to width may cause some problems. Maybe making the long wall slightly smaller (28 feet) may help suppress unwanted nodes.
For damping, I would conside either:
1) Curtains over a finished wall
or
2) Reversible panels, reflective on 1 side, absorptive on the other.
By opening or closing the curtains (or flipping the panels) you can "fine tune" the room's damping. IMO, this is the best way to deal with this issue, and it can be great looking too.
BTW, my Cremonas are in a smaller (app 18x24) room that is highly damped with carpets and curtains (always closed) and they sound very good.
Good Luck
Marty
Your plan - app 30 X 20 feet - is a pretty good size, but I was advised that a 1.5 to 1 ratio in length to width may cause some problems. Maybe making the long wall slightly smaller (28 feet) may help suppress unwanted nodes.
For damping, I would conside either:
1) Curtains over a finished wall
or
2) Reversible panels, reflective on 1 side, absorptive on the other.
By opening or closing the curtains (or flipping the panels) you can "fine tune" the room's damping. IMO, this is the best way to deal with this issue, and it can be great looking too.
BTW, my Cremonas are in a smaller (app 18x24) room that is highly damped with carpets and curtains (always closed) and they sound very good.
Good Luck
Marty