At first I was going to suggest the same thing as Unsound.
But I ended up not doing so for a couple reasons. The idea of having a sort of anteroom for the equipment would be a good thing but lead to other complications of access.
Ultimately I rejected the idea of making the room slightly smaller (in order to avoid parallel walls) was because of the sheer impact that the SC-6 has. If it were the SC4 or even the SC5 you could get away with this. But the SC6 will energize the room with so much low bass that it will be hard to avoid the rumble. You may alleviate some room modes higher in frequency but exacerbate the lower ones.
Of course at this point it is all guess work. But based on a good amount of experience with the SC6, I would avoid going any smaller in total room volume. FWIW.
But I ended up not doing so for a couple reasons. The idea of having a sort of anteroom for the equipment would be a good thing but lead to other complications of access.
Ultimately I rejected the idea of making the room slightly smaller (in order to avoid parallel walls) was because of the sheer impact that the SC-6 has. If it were the SC4 or even the SC5 you could get away with this. But the SC6 will energize the room with so much low bass that it will be hard to avoid the rumble. You may alleviate some room modes higher in frequency but exacerbate the lower ones.
Of course at this point it is all guess work. But based on a good amount of experience with the SC6, I would avoid going any smaller in total room volume. FWIW.