Which has a bigger cup — Bach 9 or Monette Cornet AP4S FL?

The Monette Cornet AP4S 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 AP4S 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 AP4S FL

Name: Monette Cornet AP4S FL
Brand: Monette

The Monette Cornet AP4S FL has a wider cup diameter.

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

The taper behind the throat leading to the shank. Affects projection and tone character.

Mouthpiece A

Bach 9

• Cornet

Backbore—

Mouthpiece B

Monette Cornet AP4S FL

• Cornet

Backbore—

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.