Kelly 5C vs Marcinkiewicz 10
The Marcinkiewicz 10 has a wider cup diameter, the Kelly 5C features a deeper cup, the Kelly 5C has a larger throat opening.
Base metal or construction (e.g. brass, stainless steel, plastic). Influences weight, response, and tone color.
Mouthpiece A
Kelly 5C
• Cornet
GeneralMaterialLexan polycarbonate
Best suited for
High-volume projection — open throat for power
Mid-range all-purpose
vs
Mouthpiece B
Marcinkiewicz 10
• Cornet
Material—
Best suited for
Orchestral playing — large cup for full, dark tone
Material
The Kelly 5C is described as Lexan polycarbonate, and the Marcinkiewicz 10 as unspecified. Material affects mass, warmth, and how quickly the piece responds.
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.