The bags just created another problem for me. The problem is that I like them. Doh!
I'll probably keep some of them. Maybe use the material on my soffits? I'll build soffits, since they definitely work better. If I tried to come close with these bags. I would have to put two of them, side by side in each corner. Then at the top ceiling corner also. I'm afraid that might be a bit too much of the bags. Soffits just appear as a pillar in the corner.
As I said. I have an acoustic testing microphone coming. To get a clear view of what I'm doing.
Soffits are simply a square shape that goes up the corner. Most build two of them that are four feet tall each. Stack two of them. It is said to use either fluffy insulation or low density mineral wool panels. The fluffy shouldn't be too fluffy. Use the kind that will sit in a wall and not drop. It will stand up on it's own. Doesn't have a backing to staple to the studs. This is the kind of density of fluffy that will work good. That is the kind of fluffy I have in my bags now.
As I said. Bass is the big problem. Tone down it's bouncing around. Knock out it resonating in the room. You've taken care of most of the problems.
Next step is to take care of the early reflections at the listening position.
Only thing is, when I'm done. The room will look very pretentious. I'm a very unpretentious person. I like the "coffee fiend" look.
So I'm looking at keeping the bags in some context.
EDIT: That bass note you usually hear from sound systems. When you can't hear anything else. Just it. That's usually about 40Hz. And the harmonics of it.