Marcinkiewicz 3C vs Monette Cornet E1-5M S12
The Marcinkiewicz 3C has a wider cup diameter, the Monette Cornet E1-5M S12 features a deeper cup, the Marcinkiewicz 3C has a larger throat opening.
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
Marcinkiewicz 3C
• Cornet
Cup diameter17.20 mm / 0.6772 in
Best suited for
Orchestral playing — large cup for full, dark tone
vs
Mouthpiece B
Monette Cornet E1-5M S12
• Cornet
Cup diameter17.00 mm / 0.6693 in
Best suited for
Orchestral playing — large cup for full, dark tone
Cup Diameter
The Marcinkiewicz 3C has a cup diameter of 17.20 mm / 0.6772 in compared to 17.00 mm / 0.6693 in on the Monette Cornet E1-5M S12 — a difference of 0.20 mm / 0.0079 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.