Outside my bedroom window, there is a store air conditioner which runs 24/7. It's noisy in general, but closing the window takes care of most higher frequencies. My issue is with a specific low frequency (around 50hz I think) which obviously does not yield to my windows or curtains.
Now, when sleeping with my head against the back wall of the bedroom, this low frequency noise is very noticeable and is generally an issue for sleeping well. However, if I turn around and sleep with my head towards the center of the room the noise is barely noticeable.
I accept my lack of options in regards to blocking the noise getting into the room, but I'm wondering if there is a way to mitigate it even when sleeping closer to the wall. Would a acoustic foam on the wall by the top of the bed help at all?
And in general, is what I'm dealing with here the waves reverb in the room? do reverb solutions (foam, soft surfaces, etc.) help at all with such low frequencies?