Bach 1B vs Marcinkiewicz 300
The Marcinkiewicz 300 has a wider cup diameter, the Bach 1B features a deeper cup, the Marcinkiewicz 300 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 300
• Cornet
Cup diameter17.58 mm / 0.6921 in
Cup Diameter
The Marcinkiewicz 300 has a cup diameter of 17.58 mm / 0.6921 in compared to 17.00 mm / 0.6693 in on the Bach 1B — a difference of 0.58 mm / 0.0228 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.