Denis Wick 3 vs Kelly 7C
The Denis Wick 3 has a wider cup diameter, the Denis Wick 3 features a deeper cup, the Denis Wick 3 has a larger throat opening.
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
Denis Wick 3
• Cornet
Cup diameter16.75 mm / 0.6594 in
Best suited for
High-volume projection — open throat for power
vs
Mouthpiece B
Kelly 7C
• Cornet
GeneralCup diameter16.51 mm / 0.6500 in
Best suited for
All-round versatile — balanced cup for general playing
Beginner / intermediate
Cup Diameter
The Denis Wick 3 has a cup diameter of 16.75 mm / 0.6594 in compared to 16.51 mm / 0.6500 in on the Kelly 7C — a difference of 0.24 mm / 0.0094 in. A wider cup generally produces a fuller, darker tone but requires more air support.
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.