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 width of the rim surface that contacts the lips. Wider rims improve endurance; narrower rims improve flexibility.

Mouthpiece A

Bach 1D

• Cornet

Rim width—

Mouthpiece B

Yamaha CR-14B4L

• Cornet

Rim width—

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.