Quote:
Originally Posted by avare +1. thumbsup
One foot (30 cm) will give flat diffuse field absorption down to 50 Hz. Excellent response!
Andre |

Hi everyone!
I have a 50Hz modal peak in my room at the listening position. When I open my door on the rear wall, the peak reduces by around 3db, which lead me to believe the modal peak is caused by reflections from the rear wall.
My room is 10ft long, does a 50Hz wave take around 5ft to do a full cycle and this is why I have a peak at 50Hz?
Would 18 inches depth of 60Kg Density Rockwool covering my entire back wall be the 'optimum' combination for absorbing down to 50Hz?