Cartridge alignment 101
Why alignment matters more than the cartridge itself, the geometry behind it, and a step-by-step you can actually follow at home.
You can spend a fortune on a cartridge and still get mediocre sound if it's badly aligned — and a modest cartridge aligned properly can be revelatory. Alignment is the highest-leverage hour you'll spend on a turntable, and it costs nothing but patience and a printed protractor.
The geometry, briefly
A record is cut by a lathe whose cutting head moves in a straight line across the disc. A pivoted tonearm, by contrast, swings in an arc. That mismatch means the stylus can only be perfectly tangent to the groove at two points across the record — the 'null points.' Alignment is the art of choosing and hitting those two points so tracking error is minimised everywhere else.
Three things get set: overhang (how far the stylus sits past the spindle), offset angle (the cartridge's rotation in the headshell), and — separately — tracking force and anti-skate.
What you need
A two-point alignment protractor (a Baerwald or Stevenson template is fine — print one to scale), a small flat-blade and crosshead screwdriver, a stylus force gauge, and good light with a loupe or your phone's macro camera. Decks like the Pro-Ject Debut Pro and Rega Planar 3 ship aligned from the factory, but they drift, and a cartridge swap resets everything.
Step by step
1. Set tracking force to the cartridge's recommended value with the gauge, with the arm floating level. 2. Place the protractor over the spindle. 3. Lower the stylus onto the first null point and adjust overhang by sliding the cartridge in the headshell slots until the stylus sits exactly on the grid. 4. Rotate the cartridge so its body is parallel to the protractor's reference lines — this sets offset. 5. Repeat on the second null point and split any difference between the two. 6. Recheck tracking force, set anti-skate to match, and confirm the stylus is vertical (azimuth) from the front.
Work slowly, re-checking force after every adjustment — moving the cartridge changes effective mass. When both null points are clean, you're done. The improvement in inner-groove clarity is usually obvious on the first record.
