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Would it be fair comment to say that IF this null is caused by room nodes alone, there should be an equally big peak at another frequency, because the same reflections caused by room dimensions will - depending on the frequency - create a null or a peak. There should also be visible harmonics of these peaks and nulls.
If that is the case, then more bass trapping will certainly even things out.
But if it's just a big sink at 160Hz, I would be looking for whatever is doing that.
What happens if you pump a strong 160 Hz sine wave into the room? Does anything resonate?
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