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So in the process of fixing my room. I don’t need the silver bullet answer, but I’d just like to know from some of the people here what process you would go through to solve the following:

I have a loudspeaker placed in my room. It’s fairly flat when measured outside. When I place in my room, I have three bass nulls at my listening position. I have one at 60hz, one at 100hz, and one at 200hz.

I’m thinking these might be due to floor to ceiling reflections. My speaker is 3ft off the floor, 6 feet from the ceiling. Those measurements are 1/2 the wavelength of 60 and 100hz. See what I’m getting with? So some treatment on the ceiling should help.

I already have treatments in the corners of the room that fixed the muddy sound of the room.

Again, just a general question and would like some advice on where to look to solve the issue.

I am not interested in moving the speaker to a different location so please don’t suggest that. This is more of an practice and learning experience rather than a final placement of the speaker.

Let me know and thanks!

Cheers,
J