Bob Reeves 40/B/2 vs Yamaha CR-14ES-GP
The Yamaha CR-14ES-GP has a wider cup diameter.
Mouthpiece A
Bob Reeves 40/B/2
• Cornet
Cup diameter15.88 mm / 0.6252 in
Cup depthVery deep
Rim width—
Throat diameter—
Backbore2
Finish—
Material—
vs
Mouthpiece B
Yamaha CR-14ES-GP
• Cornet
Cup diameter16.86 mm / 0.6638 in
Cup depthVery deep
Rim width—
Throat diameter3.98 mm / 0.1567 in
BackboreStandard
Finish—
Material—
Best suited for
Orchestral playing — large cup for full, dark tone
High-volume projection — open throat for power
Cup Diameter
The Yamaha CR-14ES-GP has a cup diameter of 16.86 mm / 0.6638 in compared to 15.88 mm / 0.6252 in on the Bob Reeves 40/B/2 — a difference of 0.98 mm / 0.0386 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
Both mouthpieces share a very deep cup depth, so the sound character from depth alone will be very similar.
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.