Bach 2½C vs Marcinkiewicz 3C
The Marcinkiewicz 3C has a wider cup diameter, the Marcinkiewicz 3C features a deeper cup, the Marcinkiewicz 3C has a larger throat opening.
The taper behind the throat leading to the shank. Affects projection and tone character.
Mouthpiece A
Bach 2½C
• Cornet
Backbore—
Best suited for
All-round versatile — balanced cup for general playing
vs
Mouthpiece B
Marcinkiewicz 3C
• Cornet
Backbore—
Best suited for
Orchestral playing — large cup for full, dark tone
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.