Bach 5A vs Monette Cornet B3F S7
The Monette Cornet B3F S7 has a wider cup diameter.
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
Bach 5A
• Cornet
Cup diameter16.25 mm / 0.6398 in
vs
Mouthpiece B
Monette Cornet B3F S7
• Cornet
Cup diameter16.30 mm / 0.6417 in
Cup Diameter
The Monette Cornet B3F S7 has a cup diameter of 16.30 mm / 0.6417 in compared to 16.25 mm / 0.6398 in on the Bach 5A — a difference of 0.05 mm / 0.0020 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.