Normalization has nothing at all to do with this. A recording with very limited dynamic range will sound "louder" than one with a wide dynamic range. It will sound that way even when "normalized" because its average volume is higher.
If you’re on a noisy subway, its easy for quiet passages on a wide DR recording to get lost beneath the ambient noise level of the subway car. Whether that signal was normalized or not has absolutely no bearing on it.
Do you think AC/DC tends to sound louder than a string quartet?