Which has a bigger cup — Bach 3D or Yamaha CR-11B4L?

The Yamaha CR-11B4L has a cup diameter of 16.64 mm / 0.6551 in compared to 16.30 mm / 0.6417 in on the Bach 3D — a difference of 0.34 mm / 0.0134 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bach 3D and Yamaha CR-11B4L?

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

Bach 3D vs Yamaha CR-11B4L

Name: Yamaha CR-11B4L
Brand: Yamaha

The Yamaha CR-11B4L has a wider cup diameter, the Bach 3D has a larger throat opening.

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 3D

• Cornet

Backbore—

Mouthpiece B

Yamaha CR-11B4L

• Cornet

BackboreSemi-wide

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.