Which has a bigger cup — Bach 5V or Yamaha CR-7D4dS?

The Bach 5V has a cup diameter of 16.25 mm / 0.6398 in compared to 16.24 mm / 0.6394 in on the Yamaha CR-7D4dS — a difference of 0.01 mm / 0.0004 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bach 5V and Yamaha CR-7D4dS?

The Bach 5V has a very deep cup while the Yamaha CR-7D4dS has a deep cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.

Bach 5V vs Yamaha CR-7D4dS

Name: Yamaha CR-7D4dS
Brand: Yamaha

The Bach 5V has a wider cup diameter, the Bach 5V features a deeper cup.

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 5V

• Cornet

Backbore—

Best suited for

📣High-volume projection — open throat for power

Mouthpiece B

Yamaha CR-7D4dS

• Cornet

BackboreSemi-wide

Best suited for

📣High-volume projection — open throat for power

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.