Wow, Viridian, you enjoy hearing noise that is 20db higher in level than the music?! Even adding the 20db to the average 50db range before hitting the noise floor, that gives you 70db. Don't worry I have measured several LP's for dynamic range and it is a rare disc that has more than 75db. Which is why I have found using an old Phase Linear 1000 range expander quite useful in restoring some dynamics to most LPs. Works well for FM broadcasts also.
Bob P.
Bob P.