Bach 5V vs Yamaha CR-7D4dS
The Bach 5V has a wider cup diameter, the Bach 5V features a deeper cup.
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
Bach 5V
• Cornet
Cup diameter16.25 mm / 0.6398 in
Best suited for
High-volume projection — open throat for power
vs
Mouthpiece B
Yamaha CR-7D4dS
• Cornet
Cup diameter16.24 mm / 0.6394 in
Best suited for
High-volume projection — open throat for power
Cup Diameter
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.
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.