Which has a bigger cup — Bach 7D or Yamaha CR-11B4L?

The Yamaha CR-11B4L has a cup diameter of 16.64 mm / 0.6551 in compared to 16.20 mm / 0.6378 in on the Bach 7D — a difference of 0.44 mm / 0.0173 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bach 7D and Yamaha CR-11B4L?

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

Bach 7D vs Yamaha CR-11B4L

Name: Yamaha CR-11B4L
Brand: Yamaha

The Yamaha CR-11B4L has a wider cup diameter, the Bach 7D 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 7D

• Cornet

Backbore—

Best suited for

🎺Lead / commercial — shallow cup for brightness and range

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.