Herman is correct. Perfect silence using the KAB device would require a cartridge (and alignment) capable of ZERO db of crosstalk. A cartridge that perfect will probably never exist. It certainly doesn't exist today.
I also agree with 42659 and Aoliviero. Depending on your system (and ears) you can get very close to optimal azimuth by listening. Proper azimuth reduces crosstalk. Reduced crosstalk improves imaging, so listen for the tightest, best defined images. Higher pitched vocals or instruments are probably best, since our hearing localizes higher frequencies better than lower frequencies.
Measurement, as suggested by Jhendrixfan, certainly works and will produce the best results possible with any given cartridge. But one can get just about as close by ear, at least IME. I've done it both ways. They both work. Use whichever one floats your boat!
Doug
I also agree with 42659 and Aoliviero. Depending on your system (and ears) you can get very close to optimal azimuth by listening. Proper azimuth reduces crosstalk. Reduced crosstalk improves imaging, so listen for the tightest, best defined images. Higher pitched vocals or instruments are probably best, since our hearing localizes higher frequencies better than lower frequencies.
Measurement, as suggested by Jhendrixfan, certainly works and will produce the best results possible with any given cartridge. But one can get just about as close by ear, at least IME. I've done it both ways. They both work. Use whichever one floats your boat!
Doug