A year ago I took a course in acoustics engineering. I wanted to be able to do my own “amateur” acoustic study so I could design the treatment that would allow me to get decent results for mixing and mastering in a room that hasn’t been designed for this in the first place. I have a project to build a proper studio in a few years but for now I have to live with a bedroom in a rental house.
I have briefly described what I did in the following pictures. I haven’t worked it through to the end because I will probably leave this house in 1 or 2 years but I have gone far enough to get very usable results with minimal investment. I highly recommend to those who want to step up their mixing game to learn about acoustics. I feel it is the most underrated thing among mixing engineers and it is hard to find reliable information online.
Empty room before moving in (4,4 x 3,15 x 2,8 m (14.5 x 10.5 x 9.2 ft)
Initial frequency response measurement. The goal is to identify the best place to set the monitors and to find out what are the issues and what type of treatment will help to deal with them.
DIY absorber panels. 8 panels were made, most of them 20 to 25 cm thick (7.9 to 9.9 inches)
Fabric cover (thick, breathable curtain-like fabric)
“Superchunk” style bass traps, 4 of them. Had to make them rather big (depth 40 cm / 15.7 inches). I inserted shelves to prevent the rockwool from caving in over time.
Room after treatment. As I mentioned I haven’t worked it through to the end, ideally I would need diffusion in the back and a bigger cloud but the measurements are good enough for me. I have a project to build a proper studio in a few years when I’m back in my home country.
BEFORE curve in red
AFTER curve in green
Waterfall chart BEFORE: huge bumps and hollows, and imbalance in reverb time throughout the frequency spectrum
Waterfall chart AFTER: the room is usable until 30 Hz in the lows with a decent control in the lows and mid-lows. Some comb filtering in the highs, but nothing major.