Static/Buzzing when using headphones

Merry Eventide to all.

Without dallying, there's this tablet i recently purchased from a retailer (physically, not online) and the issue I am having is as aforementioned;

"Static and Buzzing when using headphones".

I went back to the store to exchange the item and now with this new one I'm still receiving the same problem.

I have tried several pairs of headphones with the first one and with this being the same model, it would be much the same...

It isn't the headphones, as on my phone, everything plays clear as it should (note: the first pair is fairly new, so no faulty wiring, especially considering the phone).

A factory reset, as I've seen on some other posts elsewhere, wouldn't be sensible regarding a "fresh-out-of-the-box " tablet.

So hopefully, you have some suggestions? Other then comically going to the store and opening every box. 'P

Have a wonderful morrow.