Bob Reeves DR DINO vs Yamaha AH-37C4
The Bob Reeves DR DINO has a wider cup diameter.
Mouthpiece A
Bob Reeves DR DINO
• Baritone / Euphonium
Cup diameter25.55 mm / 1.0059 in
Cup depthMedium
Rim width—
Throat diameter—
Backbore—
Finish—
Material—
vs
Mouthpiece B
Yamaha AH-37C4
• Baritone / Euphonium
Cup diameter18.60 mm / 0.7323 in
Cup depthMedium
Rim width—
Throat diameter5.25 mm / 0.2067 in
BackboreStandard
Finish—
Material—
Best suited for
High-volume projection — open throat for power
Cup Diameter
The Bob Reeves DR DINO has a cup diameter of 25.55 mm / 1.0059 in compared to 18.60 mm / 0.7323 in on the Yamaha AH-37C4 — a difference of 6.95 mm / 0.2736 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
Both mouthpieces share a medium 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.