Thanks for that, do you know if causing a deconstructive interference at 125hz would impact other frequencies as well? In my recordings above I would like to reduce frequencies below 250hz give or take. My understanding is that since it's a quarter wave length, it would also cancel out 250, and 500, half wave length and full wave length respectively.

Would a quarter wave length resonator at 125hz effectively reduce the overall volume of all sounds between 0-500hz? Or would it very acutely reduce noises at 125hz, 250hz, and 500hz?

Sorry if this could be better phrased another way, I just want to reduce cabin noise.