See my post in the classifieds.
https://homerecording.com/bbs/special-forums/free-ads-for-music-recording-equipment/3-x6-x8-2d-quadratic-residue-bbc-skyline-diffusor-acoustic-treatment-397161/
PRICE REDUCED! For sale is a 3’ x 6’ x 8” array of qty. 6 18”x18”x8” 2D Quadratic Residue Skyline Diffusor acoustic treatment built to the BBC specification (BBC RD 1990-15) with effective diffusion down to 850 Hz. They are fabricated with select pine and have a lovely, professional...
I posted this on John L Sayers Recording Studio Acoustics forum and got a wonderful response (as in the analysis was wonderful, the feedback was quite painful but it is what it is). I am also seeking other people's option so I am grateful to anyone that can offer (an educated) opinion.
I have...