Vibrating Hum (Not Hammer) from walls after flushing toilet

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lullabynoir

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When we flush the toilet, there is a deep, low vibrating noise that comes from the wall. It is not a hammering sound. Here's a link to showcase the tail end of the noise: https://youtu.be/sC34BFcfFfk

It only seems to happen now after we flush the toilet, though when we first started hearing it, it would happen after using the sink. It also seems more apparent the colder it is.

I'm curious as to what could actually be causing it?

Is it as simple as water pressure? I have not been able to locate a water pressure regulator.

It is a 2 story house, water heater is in attic, did not hear sound in attic or outside.

We have a home warranty, but I don't want to spend the $75 to have them come look at it and say they can't do anything.

My fear is that it is a loose pipe or bracket in the wall, and if so, not being able to locate it and having multiple areas of sheetrock cut out for no reason.

Anyone with knowledge know whether this can be a simple fix, or should I do home warranty or just call a plumber for a quote/inspection?

Thanks for any help and input!
 
I made this video 7 yrs ago.

the ballcock in toilet tank is vibrating and that vibration is being transferred to your copper pipes like a violin string.

This particular one is the loudest one I have ever encountered.
Usually it a softer more subtle hum.

https://youtu.be/eUp6uke625g
 
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