Azimuth and the Fozgometer

I ordered one from Acoustic Sounds and I had it in five days (at cheapest postal rates).

It took less than 10 minutes to fine tune azimuth with this meter (very stable, unequivocal readings). Unlike the Wally instrument, the readings held steady. Also, unlike the Wally instrument, I did not have to deal with making conversions to db to do a left minus right, right minus left calculation. My adjustment from visual, perpendicular alignment was extremely small (I cannot reliably see the difference). In other words, it is a very sensitive instrument that shows the result of VERY small adjustments.

Of course, it is minimizing crosstalk at only one test frequency (1 kz on the Analogue Productions test lp), unless one finds other test lps with single channel signals at other frequencies.

After browsing the Feikert instructions, I realize that I require a no-brainer" device like the Fozgometer. It is now making the rounds of my friends.

Capnbob,

I believe the way this is done "manually" is to convert millivolts to db, then you would do a left minus right and right minus left calculation to determine crosstalk. A straight reading of channel output would not account for channel imbalance. Also, it is possible that the Fozgometer does more than just measure voltage output (e.g., it could include filters to attenuate frequencies outside of the 1khz test signal so that the effect of extraneous surface noise is reduced. I don't know if this has actually been incorporated in the design, but, I do note that the needle does not jump around a lot whereas readings done with a VOM are more equivocal. I also don't know if the Fozgometer does or does not incorporate some kind of analysis of phase relationships (aside from doing the L-R and R-L), but that is possible since Fosgate is an expert in that field (one of the pioneers of early SQ matrix form of four channel sound).