Bach 9B vs Monette Cornet AP6 Rim
The Monette Cornet AP6 Rim has a wider cup diameter, the Bach 9B features a deeper cup.
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
Bach 9B
• Cornet
Cup diameter16.05 mm / 0.6319 in
vs
Mouthpiece B
Monette Cornet AP6 Rim
• Cornet
Cup diameter16.30 mm / 0.6417 in
Best suited for
All-round versatile — balanced cup for general playing
Cup Diameter
The Monette Cornet AP6 Rim has a cup diameter of 16.30 mm / 0.6417 in compared to 16.05 mm / 0.6319 in on the Bach 9B — a difference of 0.25 mm / 0.0098 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.