Calculation of listening room resonance frequency
1. Normal ditribution mode
2nd mode 2nd mode 2nd mode 2nd mode 2nd mode 2nd mode 2nd mode a.Following 3 cases are the worst.
1) find isolated frequency mode from others.
2) find the mode which shows same frequency.
3) find pair mode which differences of frequency is below 3Hz.
b.Mode 1,2,3,8,9 and 10 can be the worst cases.
2. Counter resolution
a.make reflection and absorb board base on calculation. And attach it on the wall.
A
B = 0.15 A ~ 0.3A
A = 344 / (2x normal frequency), [m]
the board should have many holes and filled with felt.
b.others
ground : carpete
wall : thick curtain
displace audio system and sofa farther from walls.