Marcinkiewicz 5*W (Endorsee) vs Marcinkiewicz 0S
The Marcinkiewicz 0S has a wider cup diameter, the Marcinkiewicz 5*W (Endorsee) has a larger throat opening.
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
Marcinkiewicz 5*W (Endorsee)
• Cornet
Cup diameter16.76 mm / 0.6598 in
Best suited for
High-volume projection — open throat for power
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 16.76 mm / 0.6598 in on the Marcinkiewicz 5*W (Endorsee) — a difference of 0.97 mm / 0.0382 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.