Bach 5V vs Yamaha CR-7D4dS
The Bach 5V has a wider cup diameter, the Bach 5V features a deeper cup.
Mouthpiece A
Bach 5V
• Cornet
Cup diameter16.25 mm / 0.6398 in
Cup depthVery deep
Rim width—
Throat diameter4.09 mm / 0.1610 in
Backbore—
Finish—
Material—
Best suited for
High-volume projection — open throat for power
vs
Mouthpiece B
Yamaha CR-7D4dS
• Cornet
Cup diameter16.24 mm / 0.6394 in
Cup depthDeep
Rim width—
Throat diameter4.10 mm / 0.1614 in
BackboreSemi-wide
Finish—
Material—
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.
Cup Depth
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.
Throat Diameter
Throat diameters are essentially identical at 4.09 mm / 0.1610 in, so resistance feel will be comparable.
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.