Bob Reeves 43N/S/69 vs Yamaha TR-14B4
The Bob Reeves 43N/S/69 has a wider cup diameter.
Mouthpiece A
Bob Reeves 43N/S/69
• Trumpet
Cup diameter17.07 mm / 0.6720 in
Cup depthShallow
Rim width—
Throat diameter—
Backbore69
Finish—
Material—
vs
Mouthpiece B
Yamaha TR-14B4
• Trumpet
Cup diameter16.85 mm / 0.6634 in
Cup depthShallow
Rim width—
Throat diameter3.65 mm / 0.1437 in
BackboreSemi-narrow
Finish—
Material—
Cup Diameter
The Bob Reeves 43N/S/69 has a cup diameter of 17.07 mm / 0.6720 in compared to 16.85 mm / 0.6634 in on the Yamaha TR-14B4 — a difference of 0.22 mm / 0.0087 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.
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.