Bach 3C vs Marcinkiewicz 6S
The Marcinkiewicz 6S has a wider cup diameter, the Marcinkiewicz 6S has a larger throat opening.
The taper behind the throat leading to the shank. Affects projection and tone character.
Mouthpiece A
Bach 3C
• Trumpet
Backbore—
Best suited for
All-round versatile — balanced cup for general playing
vs
Mouthpiece B
Marcinkiewicz 6S
• Trumpet
Backbore—
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.