| Re: Tracking my acoustic treatments...
Absorption is really only good to about 1/4 wavelength....
90Hz is about 12feet which means you need an absorber panel on the order of 3ft thick in order for it to be "effective".
45Hz would need to be 6ft, and 20Hz about 12ft (yikes).
Another thing to watch out for is HF reflections....even though it's an "absorbent material", most of the foam type solutions are actually reflective at the higher frequencies. It's probably no worse than a bare wall, but the acoustical properties vary quite a bit with different frequencies.
The most effective solution for really low frequency acoustical treatment is actually a helmholtz resonator. The tricky part is that the tolerances are quite small in order for it to be effective...which is where having the ability to measure results becomes extremely handy.
-Mike Bentz ~It's all about compromise~ "It's territorial with the soundboard. So you're mixing and some dude comes by spewing opinions and trying to turn knobs. It's akin to going up to an artist and painting over his unfinished masterpiece. You just want to shove your paint brush up his nose and throw the soundboard out the window!" |