Bach 5V vs Kelly 6V
The Bach 5V has a wider cup diameter, the Kelly 6V features a deeper cup, the Bach 5V has a larger throat opening.
Base metal or construction (e.g. brass, stainless steel, plastic). Influences weight, response, and tone color.
Mouthpiece A
Bach 5V
• Cornet
Material—
Best suited for
High-volume projection — open throat for power
vs
Mouthpiece B
Kelly 6V
• Cornet
Dark/DeepMaterialLexan polycarbonate
Best suited for
High-volume projection — open throat for power
Deep V-cup to fill out cornet sound
Material
The Bach 5V is described as unspecified, and the Kelly 6V 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.