Marcinkiewicz 300 vs Marcinkiewicz 303
The Marcinkiewicz 300 has a wider cup diameter, the Marcinkiewicz 303 features a deeper cup.
How deep the cup is, from shallow (brighter, easier high register) to deep (darker, fuller sound).
Mouthpiece A
Marcinkiewicz 300
• Cornet
Cup depthVery shallow
vs
Mouthpiece B
Marcinkiewicz 303
• Cornet
Cup depthShallow
Cup Depth
The Marcinkiewicz 303 has a shallow cup while the Marcinkiewicz 300 has a very shallow cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
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.