Kelly 3C vs Monette Cornet E1-5M S12
The Kelly 3C has a wider cup diameter, the Kelly 3C has a larger throat opening.
The narrowest point at the bottom of the cup. Affects resistance, volume, and tone color.
Mouthpiece A
Kelly 3C
• Cornet
GeneralThroat diameter4.06 mm / 0.1598 in
Best suited for
Orchestral playing — large cup for full, dark tone
High-volume projection — open throat for power
All-purpose mid-range
vs
Mouthpiece B
Monette Cornet E1-5M S12
• Cornet
Throat diameter3.66 mm / 0.1441 in
Best suited for
Orchestral playing — large cup for full, dark tone
Throat Diameter
The Kelly 3C has a wider throat (4.06 mm / 0.1598 in vs 3.66 mm / 0.1441 in). A wider throat allows more air through, increasing volume and projection but reducing resistance.
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.