rew graph with blue curves: upper and lower ply removed from backwall
second graph: (red curves) only upper ply removed from backwall
(green curves) backwall untouched, upper and lower ply is not removed
Ok, backwall is 3.6m wide, 1.4m high, at 1.4 m the sloped ceiling begins ( wich we already treated by removing the ply, after the removed ply is 8" rockwool covered with plastic) so do i tread the entire lower backwall 3.6 x 1.4 or just, lets say 2m x1.4 m and leave the corners untreated?
Front wall is already treated with 24" superchuncks in corners and entire frontwall is made death as per your recommandations.
If i sit in the backwall corners, i do not feel any bass pressure at all.
I agree, i can localise that sub behind me, even when i turn the volume much lower.
X over is on 80Hz for both subs, i will make a listen with the sub behind me on x-over 50Hz.
I tried with treadment on the backwall (blue curve), 1.5' of rockwool, 1.2m x 1.4m did maka things wurse!
All energy stays at front half of room, if i cross the midlle of the room there is not much pressure. This was before i made treatment and stays with treadment. it must be the type of room sloped ceilings on back and frontwall.
I do not know what to do anymore...
I think my best beth is to turn the volume on the front sub higher, so the 80hz dip is gone (yellow curve on graph) and then eq the peaks (maybe an antimode can do this?) from 50 to 70Hz and 20 to 40Hz.