Hi, I am having trouble finding how thick i would need of rockwool safe and sound in order to absorb fairly evenly down to 30 hz. This would be broad band absorber to absorb from 20 kHz down to 30 or 40 hz.
Thanks,
Logan D
Thanks,
Logan D
A quick guide:
1KHz - 3"
500 Hz - 6"
100 Hz - 30"
50 Hz - 60"
1KHz - 3"
500 Hz - 6"
100 Hz - 30"
50 Hz - 60"
Corner bass trapping is more effective at really low frequencies but it generally takes a lot of it. If you're having significant problems below 100Hz then maybe EQ is a better option after some moderate acoustic treatment.
The rule of thumb for effective absortion of sound is around a quarter wavelength thickness which is around 3m or so at 30 Hz. The anechoic chamber where I previously worked had 2m wedges on all 6 surfaces and was certified anechoic down to 64 Hz. If you are prepared to have less absorption at 30 Hz compared to higher frequencies then the layer can be thinner but the absorption won't be even. The chamber uses wedges so that there is a gradual impedance change to reduce the strength of reflections as sound enters the absorbing layer.
If you want high sound absorption at 30 Hz in a home then distributed subs are likely to be a more practical way to go about it.
If you want high sound absorption at 30 Hz in a home then distributed subs are likely to be a more practical way to go about it.
Thanks for the advice i have 4 15 inch subs in the room already so i should have less of a problem and i will just eq them.
