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Fortunately narrow (frequency range) suck outs similar to your's normally can't be heard. Can you hear this? What is the room size/finishes like? Where are you measuring from? How did you accurately measure down to 20 Hz?Unfortunately there is no easy answer to this. Treatments take signal away (by absorbing or trapping). To boost by 40 dB (as I'm able to read it) would take a 10,000 fold power increase (too much to ask of any amp or speaker).
Unfortunately there is no easy answer to this. Treatments take signal away (by absorbing or trapping). To boost by 40 dB (as I'm able to read it) would take a 10,000 fold power increase (too much to ask of any amp or speaker).
Bass traps with good measurable absorption at 50 Hz are relatively less common, hence my specific suggestions to consider.