Bach 3C vs Schilke M150
The Schilke M150 has a wider cup diameter, the Schilke M150 has a larger throat opening.
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
Bach 3C
• Trumpet
Cup diameter16.30 mm / 0.6417 in
Best suited for
All-round versatile — balanced cup for general playing
vs
Mouthpiece B
Schilke M150
• Trumpet
Cup diameter17.52 mm / 0.6898 in
Best suited for
High-volume projection — open throat for power
Cup Diameter
The Schilke M150 has a cup diameter of 17.52 mm / 0.6898 in compared to 16.30 mm / 0.6417 in on the Bach 3C — a difference of 1.22 mm / 0.0480 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.