Sonofjim, if your laptop has a microphone input you could just directly connect your phono stage to your laptop.
How familiar are you with using spectrum analyzer? You can use a spectrum analyzer program (like iSpectrum for the Mac) to look at the frequency components of the signal fed into the Mic input. Most spectrum analyzers programs allow you to put a cursor on a frequency peak and display the strength of the signal (in dB). This is a nice way of directly measuring the crosstalk strength from a left channel signal into the right channel and vice versa.
Adjust+ does something similar. It looks at the phase of the crosstalk signal instead - I am right now trying to figure out whether this isn't just possible with the same standard spectrum analyzer. More later...
How familiar are you with using spectrum analyzer? You can use a spectrum analyzer program (like iSpectrum for the Mac) to look at the frequency components of the signal fed into the Mic input. Most spectrum analyzers programs allow you to put a cursor on a frequency peak and display the strength of the signal (in dB). This is a nice way of directly measuring the crosstalk strength from a left channel signal into the right channel and vice versa.
Adjust+ does something similar. It looks at the phase of the crosstalk signal instead - I am right now trying to figure out whether this isn't just possible with the same standard spectrum analyzer. More later...