Ear buds or IEMs typically have a much higher sensitivity than full sized headphones. The higher the output power of your PC’s headphone out, the louder your earbuds will be at any given volume %.
There isn’t anyway around this except to manually change the volume whenever you use your earbuds.
According to this YouGov poll of least <> most trusted news sources , CNN lands bang in the middle of the pack. So not as bad as FOX, but not as high as PBS or ABC.
As for my own 2¢, all the US cable news channels are varying degrees of bad. Best to avoid, generally speaking.