Bach 5C vs Marcinkiewicz 4 / 7C
The Marcinkiewicz 4 / 7C has a wider cup diameter.
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
Bach 5C
• Trumpet
Cup diameter16.25 mm / 0.6398 in
Best suited for
All-round versatile — balanced cup for general playing
vs
Mouthpiece B
Marcinkiewicz 4 / 7C
• Trumpet
Cup diameter17.20 mm / 0.6772 in
Cup Diameter
The Marcinkiewicz 4 / 7C has a cup diameter of 17.20 mm / 0.6772 in compared to 16.25 mm / 0.6398 in on the Bach 5C — a difference of 0.95 mm / 0.0374 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.