Marcinkiewicz 306 vs Yamaha CR-14ES-GP
The Marcinkiewicz 306 has a wider cup diameter, the Yamaha CR-14ES-GP features a deeper cup, the Yamaha CR-14ES-GP has a larger throat opening.
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
Marcinkiewicz 306
• Cornet
Cup diameter17.20 mm / 0.6772 in
vs
Mouthpiece B
Yamaha CR-14ES-GP
• Cornet
Cup diameter16.86 mm / 0.6638 in
Best suited for
Orchestral playing — large cup for full, dark tone
High-volume projection — open throat for power
Cup Diameter
The Marcinkiewicz 306 has a cup diameter of 17.20 mm / 0.6772 in compared to 16.86 mm / 0.6638 in on the Yamaha CR-14ES-GP — a difference of 0.34 mm / 0.0134 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.