Which has a bigger cup — Bach 9 or Monette Cornet D4S FL?

The Monette Cornet D4S FL has a cup diameter of 16.20 mm / 0.6378 in compared to 16.05 mm / 0.6319 in on the Bach 9 — a difference of 0.15 mm / 0.0059 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bach 9 and Monette Cornet D4S FL?

Both mouthpieces share a very deep cup depth, so the sound character from depth alone will be very similar.

Bach 9 vs Monette Cornet D4S FL

Name: Monette Cornet D4S FL
Brand: Monette

The Monette Cornet D4S FL has a wider cup diameter.

Overall Comparison Cup Diameter Cup Depth Rim Width Throat Diameter Backbore Finish Material

The width of the rim surface that contacts the lips. Wider rims improve endurance; narrower rims improve flexibility.

Mouthpiece A

Bach 9

• Cornet

Rim width—

Mouthpiece B

Monette Cornet D4S FL

• Cornet

Rim width—

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.