Marcinkiewicz 307 vs Marcinkiewicz 2 / 7B
The Marcinkiewicz 2 / 7B has a wider cup diameter.
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
Marcinkiewicz 307
• Cornet
Cup diameter17.20 mm / 0.6772 in
vs
Mouthpiece B
Marcinkiewicz 2 / 7B
• Cornet
Cup diameter17.27 mm / 0.6799 in
Cup Diameter
The Marcinkiewicz 2 / 7B has a cup diameter of 17.27 mm / 0.6799 in compared to 17.20 mm / 0.6772 in on the Marcinkiewicz 307 — a difference of 0.07 mm / 0.0028 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.