Marcinkiewicz 313 vs Marcinkiewicz E3.1JWM
The Marcinkiewicz 313 has a wider cup diameter.
Mouthpiece A
Marcinkiewicz 313
• Cornet
Cup diameter17.20 mm / 0.6772 in
Cup depthDeep
Rim width—
Throat diameter3.73 mm / 0.1469 in
Backbore—
Finish—
Material—
Best suited for
Orchestral playing — large cup for full, dark tone
vs
Mouthpiece B
Marcinkiewicz E3.1JWM
• Cornet
Cup diameter17.12 mm / 0.6740 in
Cup depthDeep
Rim width—
Throat diameter3.73 mm / 0.1469 in
Backbore—
Finish—
Material—
Best suited for
Orchestral playing — large cup for full, dark tone
Cup Diameter
The Marcinkiewicz 313 has a cup diameter of 17.20 mm / 0.6772 in compared to 17.12 mm / 0.6740 in on the Marcinkiewicz E3.1JWM — a difference of 0.08 mm / 0.0031 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
Both mouthpieces share a deep cup depth, so the sound character from depth alone will be very similar.
Throat Diameter
Throat diameters are essentially identical at 3.73 mm / 0.1469 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.