Conn Imp. Precision 4 vs Kelly 5C
The Kelly 5C has a wider cup diameter, the Kelly 5C features a deeper cup.
How deep the cup is, from shallow (brighter, easier high register) to deep (darker, fuller sound).
Mouthpiece A
Conn Imp. Precision 4
• Cornet
GeneralCup depthMedium
Best suited for
All-round versatile — balanced cup for general playing
Players with large full lips; most common surviving example
Bright tone; same as Model 3 with wide rim
vs
Mouthpiece B
Kelly 5C
• Cornet
GeneralCup depthVery deep
Best suited for
High-volume projection — open throat for power
Mid-range all-purpose
Cup Depth
The Kelly 5C has a very deep cup while the Conn Imp. Precision 4 has a medium cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
Which is better?
Both mouthpieces are categorized as "General" — the physical dimensions above will determine which suits your embouchure and playing style better.