In the previous post
, we came to the conclusion that in a correctly designed and adjusted playback system, the only source of static azimuth error is imprecision in cartridge assembly. Such alignment issues are, unfortunately, fairly common in expensive cartridges made by smaller companies.
Just how bad are these errors? Here is a photo by our reader Marco, who generously allowed us to use it. The cartridge shown is aligned like in case (c)
so that the stylus is precisely vertical. This results in the body (and the generator) of the cartridge being slanted 3.3° left. I would say it is rather typical and isn't the worst case by far.
Assuming a specified channel separation of about 25 dB, slanting the generator 3.3° will decrease it by 6 dB to 19 dB. This is worse than a $35 AT95E
, makes a joke of manufacturer's published specifications, and reinforces the argument that the cartridges with assembly azimuth error are defective.