Which has a bigger cup — Bach 2½C or Yamaha CR-11C4S?

The Yamaha CR-11C4S has a cup diameter of 16.46 mm / 0.6480 in compared to 16.40 mm / 0.6457 in on the Bach 2½C — a difference of 0.06 mm / 0.0024 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bach 2½C and Yamaha CR-11C4S?

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

Bach 2½C vs Yamaha CR-11C4S

Name: Yamaha CR-11C4S
Brand: Yamaha

The Yamaha CR-11C4S has a wider cup diameter, the Bach 2½C 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 2½C

• Cornet

Backbore—

Best suited for

🎵All-round versatile — balanced cup for general playing

Mouthpiece B

Yamaha CR-11C4S

• Cornet

BackboreSemi-narrow

Best suited for

🎵All-round versatile — balanced cup for general playing

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.

Open in interactive tool + Add third mouthpiece Bach 2½C details Yamaha CR-11C4S details Bach 2½C equivalents Yamaha CR-11C4S equivalents

Bach 2½C vs Yamaha CR-11C4S

Playing Characteristics

What Do These Model Names Mean?

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Which is better?

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