Bach 8½A vs Monette Cornet D4LS S1
The Monette Cornet D4LS S1 has a wider cup diameter, the Bach 8½A features a deeper cup.
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
Bach 8½A
• Cornet
Cup diameter16.10 mm / 0.6339 in
vs
Mouthpiece B
Monette Cornet D4LS S1
• Cornet
Cup diameter16.20 mm / 0.6378 in
Best suited for
Lead / commercial — shallow cup for brightness and range
Cup Diameter
The Monette Cornet D4LS S1 has a cup diameter of 16.20 mm / 0.6378 in compared to 16.10 mm / 0.6339 in on the Bach 8½A — a difference of 0.10 mm / 0.0039 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.