Thanks, althought I might be having some comb filtering going on with the inclined wall and window, by moving the sub a bit and a pillow or 2 I managed to reduce 95% of some annoying room modes(standing waves).
I did not touch any 8030c eq switches, just matched the volume to the sub.
The sub8 is not a clubsub and does resonates/rumbles a little at high spl, but since i'm using it to fill the lows moderately and on my working levels (60-75db) it's more than good enough. For a 200 bucks 8" sub that kicks in at 25/30Hz, without any whistle, it's pretty acceptable, expecially until any serious sub upgrade, imo.
I only have a sc1100 mic and rew so I would say I can't make a decent response chart yet. Will get a measurementmic when the rest of the room is emptied to decide on treatment. For now, I can conclude, that with bare treatment and a small sub, it's a killer set.