Acoustic treatment for corners.

Mmakshak,

If the doorway has a door, you might try closing it. I assume not from your posts.

You might also try toeing the speakers in slightly to minimize the uneven reflections off the sidewalls.

Another suggestion is to add diffusion at the reflection point on the sidewalls. This better distributes the reflection and will help with the imbalance.

I put 4 record cubes im each corner I feel that it helps some. It at least breaks up the waves and is 5 foot high full of records. Mike

So the differences between an open area and a more closed area with a corner might be due to bass differences and maybe first reflection?

Consider a door or window the perfect bass trap and if your corner has a door or window then open it and you'll then have the "identical to an open area" which you seek.

For the rest of us, bass traps and usually lots of them if they are of the resistive kind are the necessity. Diaphragmatic traps will take up much less footprint and most people incorrectly set up their resistive bass traps so as not to work at peak efficiency. They need to be pulled away from the wall equal to one-quarter the wavelength of the transition zone (i.e. Schroeder frequency) which is usually 300-500Hz and extend into the room as far as you can to work below this transition zone frequency. Get a hold of Dr Floyd Toole's latest book and it'll set you straight.

Wow! What a room, Kevinzoe. Without doing the work, what would that mean in inches, for say an ASC tube trap in a corner. I gather that it would be pulled out less than 7.5 inches? Do Cathedral Sound Panels act as a Diaphragmatic bass trap? In my case, the problem corner(closed area) has about 3 feet of wall before it hits a sliding glass door. There is a little bit of improvement with the glass door open.