Bach 3C vs Schilke 15
The Schilke 15 has a wider cup diameter, the Bach 3C has a larger throat opening.
The narrowest point at the bottom of the cup. Affects resistance, volume, and tone color.
Mouthpiece A
Bach 3C
• Trumpet
Throat diameter3.66 mm / 0.1441 in
Best suited for
All-round versatile — balanced cup for general playing
vs
Mouthpiece B
Schilke 15
• Trumpet
Throat diameter3.65 mm / 0.1437 in
Throat Diameter
The Bach 3C has a wider throat (3.66 mm / 0.1441 in vs 3.65 mm / 0.1437 in). 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.