Marcinkiewicz 3FLD vs Schilke 20F
The Schilke 20F has a wider cup diameter, the Marcinkiewicz 3FLD has a larger throat opening.
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
Marcinkiewicz 3FLD
• Flugelhorn
Cup diameter17.25 mm / 0.6791 in
Best suited for
High-volume projection — open throat for power
vs
Mouthpiece B
Schilke 20F
• Flugelhorn
Cup diameter17.78 mm / 0.7000 in
Best suited for
High-volume projection — open throat for power
Cup Diameter
The Schilke 20F has a cup diameter of 17.78 mm / 0.7000 in compared to 17.25 mm / 0.6791 in on the Marcinkiewicz 3FLD — a difference of 0.53 mm / 0.0209 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.