Which has a bigger cup — Bach 1D or Yamaha CR-14B4L?

The Bach 1D has a cup diameter of 17.00 mm / 0.6693 in compared to 16.85 mm / 0.6634 in on the Yamaha CR-14B4L — 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 1D and Yamaha CR-14B4L?

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

Bach 1D vs Yamaha CR-14B4L

Name: Yamaha CR-14B4L
Brand: Yamaha

The Bach 1D has a wider cup diameter, the Bach 1D 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 1D

• Cornet

Backbore—

Mouthpiece B

Yamaha CR-14B4L

• Cornet

BackboreStandard

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.