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As well as the above. What is the input impedance and is it static over the frequency range. And also the frequency response, is it flat and does it stay flat at all input levels? And is the input floating from ground?
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The input is the input of your sound car, so only you can answer those questions.
My only problem with using a sound card for setting up the phono, is you need to be able to see the square wave response and I would think that at least 200kHz bandwidth would be needed to get any meaningful results. You also need a source of square waves and a inverse riaa circuit of some sort.