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How to record low frequency mechanical wave,such like noise of pump?

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youta556:
When My neighbor use water pump, I feel low frequency noise in room.
I think the noise come from sound wave,maybe add some resonance but I cannot feel vibration when I touch wall.
I try to talk with neighbor,before that I would like to record the noise as proof.
I have questions as below:
1.How to distinguish the noise,is that sound wave or resonance?
2.As I have only iphone and mono sound recorder,is that possible to record low frequency noise?

Thanks in advance.

ledtester:
Find a spectrum analyzer app for your phone. It might identify the frequency you are sensing.

eugene:
You need to record the output of an accelerometer. Phyphox on your phone might work well enough. Good for the price...

ebastler:
I would suggest that you talk to your neighbor right away. Explain the situation, ask them to turn on the pump and come over to your place for a moment. Listening to the noise "live" will be the only way to get a perspective how noticeable and potentially annoying it is.

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