Bach 8½A vs Kelly 4B-UK
The Kelly 4B-UK has a wider cup diameter, the Kelly 4B-UK features a deeper cup, the Kelly 4B-UK has a larger throat opening.
The taper behind the throat leading to the shank. Affects projection and tone character.
Mouthpiece A
Bach 8½A
• Cornet
Backbore—
vs
Mouthpiece B
Kelly 4B-UK
• Cornet
OrchestralBackboreXL
Best suited for
High-volume projection — open throat for power
Professional cornet; British brass band
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.