I finally moved my sub to the back of the room following all the advice I got way back here
, and I completed and placed my bass traps. Here are my results.
My Room Sim was unusual as it suggested the most ideal MLP to be in the dead center of the room. This was it's prediction:
My result (didn't save it) didn't look anything like that (even a 1" movement in Room Sim seems to destroy this particular prediction. I found the ideal sub placement and MLP to be with the MLP 105" into the room, center width.
Room Sim's version of this placement:
This is a bit jumbled, but stick with me if you will. Here is a comparison of no treatment (red) to two full height corner bass traps up front (green) with two tweaks*. More on that later.
purple instead of red for some reason--but corresponds to the All SPL above it.
After spending nearly a month's worth of "free time" (which wasn't a lot TBH) I guess I was hoping for a flatter response.
Here's what I found interesting and could use some advice on (actually, I'm soliciting all advice on anything you see here!!).
I have a set of double, solid core doors with air-tight gaskets to enter the room. It seems like that is messing with my response!
By opening the interior door I drop a peak by a number of dB, and raise a null. The door cavity is airtight (double wall construction all around). I've read that drilling holes between the doors to provide airflow into the wall cavities can help...but now I can't dig up that advice.
I was worried this would short-circuit my soundproofing. Thoughts? Advice? Also of note, my rack's plexiglass door was creating havok, and I removed it to get to the point you see as "best result", no plexi-door and one door open.
Here's where I'm at utilizing best placement, no plexi-glass door and one door open. Also, two 7ft tall bass traps (corner chunk Roxul Safe N Sound) in the front two corners.
Where do I go from here?
Room Sim doesn't seem to be able to come up with a 2nd sub fix for this room. The back wall is problematic as it has those double doors, and a cubby for the equipment rack. There is really only four feet of treatable area on the back wall.
I'm open to all suggestions--really interested in your thoughts on drilling holes (how big, how many?) between the casing of the two double doors. Would love to be able to keep my (expensive!) plexi door for my rack too...
PS I tested pulling the traps away from the wall (they're free-standing) in 1" increments. I could see no benefit going beyond 1". I went all the way to 8", which was the maximum feasible in my room. My traps are faced with 6mil poly.