why do songs/videos sound louder/quieter even if they are played at the same volume?

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like, let’s say I had a video of someone whispering and someone yelling and I played them both at 30 volume. The one of the person whispering would be quieter than the one of the person yelling, or if I had a song and someone yells in the middle, the yell would be louder than the rest even though the volume didn’t change.

In: 5

The volume control on a speaker, radio, TV, etc. controls the level of amplification of the source sound. So, in your case of a whisper vs. yelling, since they are both being amplified the same amount, they’re going to retain their relative “loudness” with respect to each other.

Think of your volume knob as more like the ‘maximum possible volume’. The whisper vs shouting will always be quiet/loud relative to each other because it ws recorded that way (and therefore made permanent).

The volume of a song video is determined by both the volume of the speaker playing and the sensitivity of the inputs that record. Volume can also be tweaked so certain sounds or effects are louder than others to give the illusion of acoustics and stuff

Mix engineers decide what overall volume to place certain sounds relative to one another. Mastering engineers then decide how loud (and other overall features) the song should be in relation to 0dB Full Scale, which is the maximum loudness any digital recording could be.

Additionally, streaming services have enacted standards as to how loud the average loudness of a song or video should be, and if it’s too loud it’ll be turned down. For example, if a song is -8dBFS average and YouTube requires it be an average of -11dBFS or less, it’ll turn it down 3dB.

Audio signals essentially store sound waves as (usually) 44,100 or 48,000 dots per second, and each dot is basically defined as “X percent of maximum signal.”

The volume on the TV dictates “Given a signal of X percent of maximum, deliver Y amount of current to the speaker.” So a higher volume setting turns up how hard the speaker cone moves for every possible value of X, but X can still be anywhere from 0-100.