Hey people,
I measured my studio with Room Eq Wizard, a couple of times. i don't have a measurement mic so i used one I have, in this case it's a Violet Designs Dark Knight. I know, it will add some coloration but for the low frequencies it should give me some idea of possible problems. It resulted in the following waterfall diagram.
I see 3 problems: a peak with long decay at 41 Hz and 132.5 Hz, and a big dip at around a 100 Hz. I recognize the 132,5 one, that's a frequency I regularly cut while eq'ing my bass guitar, and with kick drums. If I do a frequency sweep the peaks and dip are clearly audible.
The wavelength of 132,5 hz is 343 m/s (speed of sound at 20 deg) / 132,5 hz = 2,59 meter, about the height of my studio. The sidewalls of my studio are angled but my ceiling is not, so this could be the reason for a standing wave. I could tackle this issue in 2 ways: by making an angle in my ceiling (could do this with plywood) but that's a pretty radical solution, I would have to make a pretty solid construction. The other one could be absorbing this wave. So I would need to make a narrow band bass trap. Can anybody give me some direction in how to calculate this trap?
100 Hz dip is harder for me to explain, it could be a result of other standing waves interfering, so getting rid of the 132 one would be my first step.
Any help is much appreciated!