Bach 8½A vs Kelly 6V-UK
The Bach 8½A has a wider cup diameter, the Kelly 6V-UK features a deeper cup, the Kelly 6V-UK has a larger throat opening.
How deep the cup is, from shallow (brighter, easier high register) to deep (darker, fuller sound).
Mouthpiece A
Bach 8½A
• Cornet
Cup depthVery deep
vs
Mouthpiece B
Kelly 6V-UK
• Cornet
Dark/DeepCup depth
Best suited for
High-volume projection — open throat for power
Deep V-cup cornet sound
Cup Depth
The Kelly 6V-UK has a — cup while the Bach 8½A has a very deep cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
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.