Hey, i just got my 2 decks and some vinyl, excited ofc but i keep hearing this "huuuuum" noise when I put my sound too high, and im pretty sure it's because Im using speakers meant for PC's I've been told I should buy an amplifier, but I need a lot of info first, such as: - Which speakers should I buy? - What exactly does an amp do, and why is it so necessary? - Which amp should I buy (maybe a pack with the speakers)? - What's the main connection type between the speakers and the amp? Thanks!