Azimuth 2020

Robert, please define “optimizing the left and right channel high frequency response “ for frequency >20khz and how you would do it. Thx.

I don't know all the inner workings of the Foz, but based on the stated method of crosstalk, I can tell you it is not optimizing azimuth, which means it is not optimizing what the needle can extract from the record.

I guess you should contact Jim Fosgate and help him create a better and more accurate device.
I have done a crosstalk measurement using a DMM after setting with Foz, my results gave me a crosstalk of more than 32dB using 1KHz tone, which lines up with the Lyra spec. Also using the Wally chart the channel difference is less than 1dB.
I'm sure this is not always spot on every time, but it remains the range I get when I do test.
Again, everyone should align with what they are comfortable with and then listen and reset as needed till you hear improvement. Then sit back and enjoy...why beat your head against the wall?? 
It will never be 100% perfect, analog records and turntables are a mechanical moving physical media, get as close as you can. 

Very interesting discussion. BTW there is a new tool on the market, built by Sperling, the German Phono builder: PDM-1 by Sperling Audio. Looks much more serious than the Fozgometer. I have no experience with it.

usually I prefer adjusting Azimuth with well known puristic recorded LPs. I am not looking at the center stage reproduction rather than at an equally room reproduction in both channels and at the straight edge on the sides and rear of the mapped room.

If you know where to listen to it is very simple. With perfect Azimuth alignment it is all about degrees... it is about arc minutes (=1/60 degree) or about arc seconds (=1/3600 degree!!)...

Best
E.

Not sure why I would give a company free consulting. Fosgate device is just one method. Not my fault it does not properly set azimuth for cartridges without perfect manufacturing.
Lewm, I linked an article with graphs that show high frequency response with and without proper azimuth alignment.

"PDM-1 by Sperling Audio" and it's only $2026.