My understanding is that the Foz (V1 and V2) uses channel balance and channel separation/crosstalk to set azimuth, but does not take into account phase angle to set azimuth. The Foz assumes the best channel separation/crosstalk will be at the same point where there is zero phase angle, which is what it should be in theory but, given manufacuting variability, is not always the case in actuality. But the Foz is better than some.of the other ways of adjusting for azimuth.
Fozgometer V2
I've been interested in a fozgometer for some time now. I'd like one to help me understand crosstalk and channel separation, so I've been aiming to pick one up. Stopped by a dealer today, was told they're essentially "for people who want to waste money" and "why would you need one of those when you can put on a modern pop mono record" to measure Azimuth. I was told this tool isn't any more more correct or exacting than your ears, but they've never used a Fozgometer (even though they have access to them. I've tried this particular dealer multiple times and just always seem to leave with a bad taste in my mouth and always ask myself why I torture myself with even visiting them.
What are some general thoughts on the Fozgometer V1 or even V2? I don't own an oscilloscope nor do a have local hifi enthusiasts to help educate me. My current setup for cartridge alignment is the mirrored version that's available for $15. I'm looking to get more precision out of my alignment and figured the Fozgometer was a tool to not only measure, but to corroborate what I'm hearing. Any advice?