Marcinkiewicz CH BS FL vs Marcinkiewicz CH FLJM
The Marcinkiewicz CH FLJM has a wider cup diameter.
Mouthpiece A
Marcinkiewicz CH BS FL
• Flugelhorn
Cup diameter16.74 mm / 0.6591 in
Cup depthVery shallow
Rim width—
Throat diameter4.39 mm / 0.1728 in
Backbore—
Finish—
Material—
Best suited for
High-volume projection — open throat for power
vs
Mouthpiece B
Marcinkiewicz CH FLJM
• Flugelhorn
Cup diameter17.12 mm / 0.6740 in
Cup depthVery shallow
Rim width—
Throat diameter4.39 mm / 0.1728 in
Backbore—
Finish—
Material—
Best suited for
High-volume projection — open throat for power
Cup Diameter
The Marcinkiewicz CH FLJM has a cup diameter of 17.12 mm / 0.6740 in compared to 16.74 mm / 0.6591 in on the Marcinkiewicz CH BS FL — a difference of 0.38 mm / 0.0150 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
Both mouthpieces share a very shallow cup depth, so the sound character from depth alone will be very similar.
Throat Diameter
Throat diameters are essentially identical at 4.39 mm / 0.1728 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.