For who wants to know: sound perception doubles every 10dB so. 30db of dynamic range is about 8 times as much dynamic range from the perceptual perspective.
As an audio engineer I'm well aware of how decibels work and why we use them.
You're talking about subjective perception but I'm talking about objective measurements.
When someone claims that vinyl has less than half the DR of a CD then I think it's important to clarify how big of a difference it actually is. I would imagine HN would care about 16bits vs aprox 10bits of dynamic range.