Which has a bigger cup — Bach 9 or Monette Cornet B4S FL?

The Monette Cornet B4S 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.

Bach 9 vs Monette Cornet B4S FL

Name: Monette Cornet B4S FL
Brand: Monette

The Monette Cornet B4S FL has a wider cup diameter.

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

How deep the cup is, from shallow (brighter, easier high register) to deep (darker, fuller sound).

Mouthpiece A

Bach 9

• Cornet

Cup depthVery deep

Mouthpiece B

Monette Cornet B4S FL

• Cornet

Cup depthVery deep

Cup Depth

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

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.