Bach 2½C vs Kelly 5C
The Kelly 5C 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
Bach 2½C
• Cornet
Material—
Best suited for
All-round versatile — balanced cup for general playing
vs
Mouthpiece B
Kelly 5C
• Cornet
GeneralMaterialLexan polycarbonate
Best suited for
High-volume projection — open throat for power
Mid-range all-purpose
Material
The Bach 2½C is described as unspecified, and the Kelly 5C as Lexan polycarbonate. 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.