Bach 10½E vs Monette Cornet BP1-5M S12
The Monette Cornet BP1-5M S12 has a wider cup diameter, the Monette Cornet BP1-5M S12 features a deeper cup.
Cup Diameter
The Monette Cornet BP1-5M S12 has a cup diameter of 17.00 mm compared to 15.90 mm on the Bach 10½E — a difference of +1.10 mm. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Monette Cornet BP1-5M S12 has a very deep cup while the Bach 10½E has a shallow cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
Throat Diameter
Throat diameters are essentially identical at 3.66 mm, so resistance feel will be comparable.
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.