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?
Cheers.
Best Answer
Read about bass traps. There are all different types; you can build your own or buy one pre-made. It sounds like for your situation, a correctly tuned Helmholtz resonator will accomplish the task in a small package. It's supposed to be cheap and easy; try this calculator.
You can determine the frequency of your noise with this app or similar. Make sure that you see a clear low frequency peak because your phone might have a high-pass filter. If you don't see one, then try putting your phone against the wall or against the AC unit, or try another phone/tablet/etc.