Marcinkiewicz CH 303FL vs Marcinkiewicz 3FLD
The Marcinkiewicz 3FLD has a wider cup diameter.
Mouthpiece A
Marcinkiewicz CH 303FL
• Flugelhorn
Cup diameter17.20 mm / 0.6772 in
Cup depthMedium
Rim width—
Throat diameter4.32 mm / 0.1701 in
Backbore—
Finish—
Material—
Best suited for
High-volume projection — open throat for power
vs
Mouthpiece B
Marcinkiewicz 3FLD
• Flugelhorn
Cup diameter17.25 mm / 0.6791 in
Cup depthMedium
Rim width—
Throat diameter4.32 mm / 0.1701 in
Backbore—
Finish—
Material—
Best suited for
High-volume projection — open throat for power
Cup Diameter
The Marcinkiewicz 3FLD has a cup diameter of 17.25 mm / 0.6791 in compared to 17.20 mm / 0.6772 in on the Marcinkiewicz CH 303FL — a difference of 0.05 mm / 0.0020 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
Both mouthpieces share a medium cup depth, so the sound character from depth alone will be very similar.
Throat Diameter
Throat diameters are essentially identical at 4.32 mm / 0.1701 in, so resistance feel will be comparable.
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.