As far as I understand, when we talk about the dynamic range of an ADC we are referring to the ratio of the biggest signal it can handle to the smallest signal it can resolve.
On the other hand the dynamic range is defined as the difference (in dB) between the maximum input level and the noise floor of the ADC. If we neglect the noise floor, we can obtain the formula of such system as 20*log10(2^n) where n is number of bits.
In many forums I found that they are making comparison between old analog players such as vinyls and digital players such as CDs. They are making the comparison by documenting their dynamic ranges in dBs
But how is dynamic range for an analog audio device such as a phonograph or cassette player is obtained?