The audio pops from the speakers mostly occurs when typing a lot on the onscreen touch keyboard, but I think it's a more general issue related to the audio device being activated/deactivated. The audio pops are a similar to what I sometimes hear when the device wakes up from sleep, while the audio is in use. There is also a slight hissing noise from the speakers, the moment the audio device starts getting used, such as when I bring up the touch keyboard or start typing on the touch keyboard.
This hissing noise and audio pops seem to be much less pronounced on my old SP5, where I have to put my ear next to the speakers to be able to hear it, but on the SP7 I notice it at normal tablet usage distance.
I also tried searching on google for these issues, and found one reddit thread regarding the SP7.
And it seems to be a common issues in the past.
My Windows is fully up to date, and I already tried disabling the microphone, Surface Diagnostic Toolkit, manually updating Drivers & Firmware, etc.
My specs are Surface Pro 7 - i7 - 16GB - 512GB