I could actually do that with some chunks of soft foam starting wide at the front and making them smaller towards the back, mounting them on the ceiling.
What is interesting is that the room dimensions coincidentally come close to fitting the golden ratio. With 8' ceilings, a 13' wide room, 18' feet long fits the profile. The room will only be about 11' wide but the rest is correct.


"Those who preach the myths of audio are ignorant of truth."