Bach 8½A vs Marcinkiewicz 0S
The Marcinkiewicz 0S has a wider cup diameter, the Bach 8½A features a deeper cup, the Marcinkiewicz 0S has a larger throat opening.
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
Bach 8½A
• Cornet
Cup diameter16.10 mm / 0.6339 in
vs
Mouthpiece B
Marcinkiewicz 0S
• Cornet
Cup diameter17.73 mm / 0.6980 in
Cup Diameter
The Marcinkiewicz 0S has a cup diameter of 17.73 mm / 0.6980 in compared to 16.10 mm / 0.6339 in on the Bach 8½A — a difference of 1.63 mm / 0.0642 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.