Sit at your listening position and have someone move the mirror close to the side wall until you see one of the speakers. That's a spot of first reflection. Try now putting an acoustic absorbant on that spot on the wall and listen again.
Since you have two speakers and two side walls you may find multiple such spots.
This is only for mid/treble frquencies. You still have to dampen wall to wall resonance, usually apparent around 50-60 Hz.
Since you have two speakers and two side walls you may find multiple such spots.
This is only for mid/treble frquencies. You still have to dampen wall to wall resonance, usually apparent around 50-60 Hz.