Bach 22C vs Schilke 42B
The Bach 22C has a wider cup diameter, the Schilke 42B features a deeper cup, the Schilke 42B has a larger throat opening.
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
Bach 22C
• Trombone
Cup diameter23.92 mm / 0.9417 in
Best suited for
High-volume projection — open throat for power
vs
Mouthpiece B
Schilke 42B
• Trombone
Cup diameter22.99 mm / 0.9051 in
Best suited for
High-volume projection — open throat for power
Cup Diameter
The Bach 22C has a cup diameter of 23.92 mm / 0.9417 in compared to 22.99 mm / 0.9051 in on the Schilke 42B — a difference of 0.93 mm / 0.0366 in. A wider cup generally produces a fuller, darker tone but requires more air support.
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.