a_wall 0.1 "Wall absorption coefficient"
a_ceiling 0.15 "Ceiling absorption coefficient"
a_window 0.05 "Window absorption coefficient"
a_stairs 0.05 "Stairs absorption coefficient"
a_floor 0.2 "Wooden floor absorption coefficient"
TL_heavy 10[dB] "Transmission loss for heavy partitions"
TL_light 5[dB] "Transmission loss for light partitions"