Gathering

Hey, it's been a while! Alright, so not too long ago I decided to get a few different types of earbuds to do some experimenting with, well, more like dissecting. I have gotten new pairs of earbuds: one that was custom-made with a cellphone, another from a nearby dollar store, and a third pair made and issued by MGM Grand Hotel. Of course, all three brands were initially made from factories somewhere, but what is it about their manufacturing that's makes the sound quality so different for each pair? Hopefully, taking each pair apart will give me just a little more insight on what I need to know.