Bach 12E vs Marcinkiewicz 10
The Marcinkiewicz 10 has a wider cup diameter, the Marcinkiewicz 10 features a deeper cup, the Marcinkiewicz 10 has a larger throat opening.
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
Bach 12E
• Trombone
Cup diameter24.50 mm / 0.9646 in
Best suited for
High-volume projection — open throat for power
vs
Mouthpiece B
Marcinkiewicz 10
• Trombone
Cup diameter25.37 mm / 0.9988 in
Best suited for
High-volume projection — open throat for power
Cup Diameter
The Marcinkiewicz 10 has a cup diameter of 25.37 mm / 0.9988 in compared to 24.50 mm / 0.9646 in on the Bach 12E — a difference of 0.87 mm / 0.0343 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.