Marcinkiewicz 300 vs Marcinkiewicz 302
The Marcinkiewicz 300 has a wider cup diameter.
Mouthpiece A
Marcinkiewicz 300
• Trumpet
Cup diameter17.58 mm / 0.6921 in
Cup depthVery shallow
Rim width—
Throat diameter3.66 mm / 0.1441 in
Backbore—
Finish—
Material—
vs
Mouthpiece B
Marcinkiewicz 302
• Trumpet
Cup diameter17.20 mm / 0.6772 in
Cup depthVery shallow
Rim width—
Throat diameter3.66 mm / 0.1441 in
Backbore—
Finish—
Material—
Cup Diameter
The Marcinkiewicz 300 has a cup diameter of 17.58 mm / 0.6921 in compared to 17.20 mm / 0.6772 in on the Marcinkiewicz 302 — 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 3.66 mm / 0.1441 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.