Bach 1¼C vs Marcinkiewicz 6S
The Bach 1¼C has a wider cup diameter, the Marcinkiewicz 6S has a larger throat opening.
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
Bach 1¼C
• Trumpet
Cup diameter17.00 mm / 0.6693 in
vs
Mouthpiece B
Marcinkiewicz 6S
• Trumpet
Cup diameter16.84 mm / 0.6630 in
Cup Diameter
The Bach 1¼C has a cup diameter of 17.00 mm / 0.6693 in compared to 16.84 mm / 0.6630 in on the Marcinkiewicz 6S — a difference of 0.16 mm / 0.0063 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.