Flush mount bass trap idea

My studio plans are coming together, and it looks like we will begin construction in the next couple of weeks. I am trying really hard to figure out how to make my treatments all flush to the wall. I don't really want anything sticking out or protruding from the walls. Here is something I have been thinking about. I tried to sketch it as good as I could, hopefully you will get the idea. It is basically a 4" frame built into the wall and sealed. I have both a slot and open front design shown in the picture. I use 2" mineral fiber, with a 2" air pocket. I have three questions: 1) How much would this design affect my isolation? I 'm not looking for an exact number... I'm just looking for an answer like: alot, not much, too much, not at all. 2) I have a feeling (from reading other posts) that the sealed trap isn't the best idea... Is that feeling correct? 3) Is there any merit to a design like this?

Here is the sketchup file

you're going to change the configuration so something will be different - depth of the air cavity, materials, etc. but as long as you can continue the isolation bits into the recess where the trap will be installed, then impact on isolation should be less than just cutting a hole in the wall... otherwise, the trap itself would need to be part of the isolation - mass, damped, sealed, etc. what type of treatments do you need? maybe some can exist on the ceiling-wall corners, ceiling, and be able to use thinner absorbers on the walls.

I've built in slat walls, acoustic hangers, and superchunks traps. I am ordering 80 GIK D1 diffusors... I am hoping I can flush mount these too. The flush mount traps are just an addition to the slat walls, hangers, and superchunks.... I want these flush mount traps to mainly be in the ceiling and in the walls of the iso booths... Maybe just a few in the live room.

Your isolation will be impacted if you don't double up the drywall on the other side. You simply need the mass that you're cutting away. The D1's can be recessed in the same way with the same caveat though I'd leave a bit more space around them so the sides of the recess don't act as additional wells and things can scatter properly. This is going to be the same with any diffusor. Bryan

Yes, I get what you are saying. There will be double drywall on the other side w/ green glue in between. I'm not too worried about my isolation between iso's and live, and iso's and control. I guess it is what it is... I do my best, and if I lose a little bit of isolation, i can live with it.. I guess the other option would be to have a false wall