I denne linken står det noe som jeg synes er rart:
In theory, a 50 dB turntable would be noisier than a 60 dB and way noisier than a 70 dB turntable. The question is whether an average listener would really notice it.
That's because once you start dealing with S/N ratios of about 60 dB, you probably won't notice much of a difference as the S/N improves above that. Even at 50 dB, the amount of noise is quite small. To get 2 dB of noise, you'd have to have 100 dB of music. Most people cannot hear 2 dB, and definitely not when there's loud music playing.
There will be more noise from other sources that you would hear first
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Man kan da ikke dele desibeller og si at 100 dB musikk med 50dB S/N gir 2 dB støy ???