It's probably possible for "20mV input". To get that high an input signal voltage, you would be using a high output MM cartridge, and it would be reproducing a fortissimo passage of a musical piece. So, in a sense, the spec (90db for 20mV) is a "best case" scenario.
good info @lewm Just a FYI, I did an in home demo of this unit. It was "ok". I mean it was good but for 7k should have been more. Great wide soundstage and produced pinpoint imaging but it was a little flat if you ask me. Felt like the soundtage was 3 feet behind my speakers.
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