Cartridge Alignment systems
Optimum cartridge alignment will always be a compromise. There will only be two points (null points) on the record where the cartridge is at a perfect right angle to the groove of the record. Opinion varies as to where these points should lie and there are at least 4 different specifications.
Baerwald, Loefgren A and B, Stevenson
Whichever is chosen means that one portion of the record will sound slightly better than another. Frankly we do not find this a critical area of performance - yes you can hear slight differences depending on which track you play but it's not the exact science that some make it out to be as its not just about geometry. Variable friction and side force all have a part to play, which influences matters somewhat.
For a full explanation on the various alignment systems, Vinyl Engine is excellent - see alignment systems
For historical reasons our alignment gauge uses the Lofgren A system (preferred by the majority) with an inner null point approximation of approx 65mm. If you wish to use a different alignment guage or system then it makes little difference to the arms performance.