Bach 1B vs Marcinkiewicz 1 1/4C (Endorsee)
The Marcinkiewicz 1 1/4C (Endorsee) has a wider cup diameter, the Marcinkiewicz 1 1/4C (Endorsee) has a larger throat opening.
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
Bach 1B
• Cornet
Cup diameter17.00 mm / 0.6693 in
Best suited for
Orchestral playing — large cup for full, dark tone
vs
Mouthpiece B
Marcinkiewicz 1 1/4C (Endorsee)
• Cornet
Cup diameter17.45 mm / 0.6870 in
Best suited for
Orchestral playing — large cup for full, dark tone
Cup Diameter
The Marcinkiewicz 1 1/4C (Endorsee) has a cup diameter of 17.45 mm / 0.6870 in compared to 17.00 mm / 0.6693 in on the Bach 1B — a difference of 0.45 mm / 0.0177 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.