Bach 22C vs Bach 6½AL (small shank)
The Bach 6½AL (small shank) has a wider cup diameter, the Bach 6½AL (small shank) features a deeper cup, the Bach 6½AL (small shank) has a larger throat opening.
Cup Diameter
The Bach 6½AL (small shank) has a cup diameter of 25.40 mm compared to 23.92 mm on the Bach 22C — a difference of +1.48 mm. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Bach 6½AL (small shank) has a deep cup while the Bach 22C has a shallow cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
Throat Diameter
The Bach 6½AL (small shank) has a wider throat (6.63 mm vs 5.85 mm). A wider throat allows more air through, increasing volume and projection but reducing resistance.
Which is better?
Neither mouthpiece clearly dominates the other — the right choice depends on your embouchure, playing style, and the sound you're after. Try both if possible.