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

The Monette Cornet B4S rim has a cup diameter of 16.20 mm / 0.6378 in compared to 16.05 mm / 0.6319 in on the Bach 9B — 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 9B and Monette Cornet B4S rim?

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

Bach 9B vs Monette Cornet B4S rim

Name: Monette Cornet B4S rim
Brand: Monette

The Monette Cornet B4S rim 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 9B

• Cornet

Backbore—

Mouthpiece B

Monette Cornet B4S rim

• 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.