Bach 1D vs Yamaha CR-14B4L
The Bach 1D has a wider cup diameter, the Bach 1D has a larger throat opening.
Mouthpiece A
Bach 1D
• Cornet
Cup diameter17.00 mm / 0.6693 in
Cup depthShallow
Rim width—
Throat diameter3.66 mm / 0.1441 in
Backbore—
Finish—
Material—
vs
Mouthpiece B
Yamaha CR-14B4L
• Cornet
Cup diameter16.85 mm / 0.6634 in
Cup depthShallow
Rim width—
Throat diameter3.65 mm / 0.1437 in
BackboreStandard
Finish—
Material—
Cup Diameter
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.
Cup Depth
Both mouthpieces share a shallow cup depth, so the sound character from depth alone will be very similar.
Throat Diameter
The Bach 1D has a wider throat (3.66 mm / 0.1441 in vs 3.65 mm / 0.1437 in). A wider throat allows more air through, increasing volume and projection but reducing resistance.
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.