Phono stage hiss - Measurements

[Out of Gum]

I got the following reply from Mathieu:

Hi Maarten,

I recommend you give the audio sample you sent me a try on any digital input of your amplifier, using your computer as a source. USB is a good choice.
That will give you a rendition of the noise floor spectrum. Of course you will have to apply a lot of gain on your amp to hear something (probably in the positive region)

Note that this analysis is only the first of a series : now please also send me the same recording but with your turntable connected and motor off
Then the same with motor on
Then the same playing a silent track from a test record.
etc...

We are in the beginning of a incremental process. We have now the proof that the internal A/D convertor is within our specs.

BR,
Mathieu

I will keep you posted