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In Progress Something making a buzzing noise.

So I'm making this post because I'm not entirely sure if this is a fan, because it is way too soft for that.. I've had many fans fail on me and they're not nearly as soft as this.. I will link a video below, it's really quiet and starts at around 5 seconds so be sure to crank it up.. Seriously, it's really quiet but also a bit bassy..

This happens every ~35 seconds and will last ~5 seconds before everything is back to normal.. When this happens, nothing happens to my PC itself.. I had many monitoring apps open at the same time and as soon as that noise starts, everything stays stable.. The noise is A LOT louder and lasts a lot longer if the PC has been off for some time especially during the winter. This has been happening for a few years but it only started to annoy me now as I've moved into a much smaller place and it's very clear late at night when I'm trying to sleep and everything is quiet enough for this sound to be loud enough..

I never hear it during the day because of gaming and noise cancelling headphones but, yeah.. There are a number of reasons why I sleep with my PC on and would just like to know if this is a fan dying or my AiO Liquid Cooler being wonky.. Thanks in advance..

Unlisted video:

Note: I have replaced all 6 case fans after this noise started due to them slowly dying over time.. I also got a new GPU in that time but I still have the same PSU..
 
I would disconnect one fan at a time to see if that isolates it.
I agree, it sounds to soft to be a fan, but maybe the sheer number of fans, plus the CPU, GPU and PSU (and the 6 case fans) all combined are making the ambient noise.

Also poke a soft bristled brush (temporarily to stop the blades) into the PSU fan, CPU fan, and GPU fan to see if that helps.