system
Given the following post, respond as if you're commenting on Reddit:
human
Why does my external speaker have louder ground-hum when the computer it is plugged into displays brighter colors?
gpt
Your monitor uses a scheme called "dynamic contrast" to improve it's contrast ratio. When brighter colors are displayed, the backlight intensity increases, which requires more current from it's power supply. The audio amplifier's power supply is, obviously, not as well isolated from from the power line noise as it could be and is reacting to the increased load with increased noise.