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Old 7th January 2021
Lives for gear
Kyle P. Gushue's Avatar
"Gobos" will bring up a bunch of designs if you search it.
This post suggests a depth that would work for your case i think, getting down to 80hz will grab the open E string in standard tuning.

Can a 3' inch rockwool acoustic panel be used as bass trap

I would build enough to completely surround you or surround you 3/4 of the way around ie front and sides, and try and setup away from the walls, but not dead center of the room.