system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:Why do speakers make a buzzing noise when the volume is turned up?
gpt
Speakers are powered by an amplifier.

An amplifier takes a low-level signal as an input, amplifies it, and pushes it through the speakers to make sound.

When no input is present, the amplifier basically amplifies the background noise. When you turn it up, as you might expect, it gets louder, and becomes more noticeable (but it's *always* there, in *every* amplifier, you just can't always hear it.) There is some amount of electronic interference from everything with electricity, including within the amplifier itself. This is where that buzz/hiss/white noise/static (whatever you want to call it) comes from. It's the sound of the amplifier being on, essentially.

Audiophiles refer to this as a "noise floor". When you start looking at higher end amplifiers, better parts and designs are used, resulting in less interference, and therefore, a lower noise floor.