Bach 9D vs Kelly SCREAMER-UK
The Bach 9D has a wider cup diameter, the Bach 9D has a larger throat opening.
The taper behind the throat leading to the shank. Affects projection and tone character.
Mouthpiece A
Bach 9D
• Cornet
Backbore—
Best suited for
Lead / commercial — shallow cup for brightness and range
vs
Mouthpiece B
Kelly SCREAMER-UK
• Cornet
LeadBackboreS
Best suited for
Lead / commercial — shallow cup for brightness and range
Screamer / high notes — tight throat with shallow cup
Lead / soprano cornet
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.