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I was doing some measurements to see if my bass nulls from a new speaker placement ended up where predicted by math. Sure enough they do and there is a cancellation at 130-140 Hz. I got curious to see if absorption would be effective near the speaker. I thought to myself, why not place a bag of carbon and salt water wearing clothes up against the wall and see how the measurement changes?
Sure enough, it works!
Sure enough, it works!