Which has a bigger cup — Bob Reeves DR DINO or Yamaha AH-38D4?

The Bob Reeves DR DINO has a cup diameter of 25.55 mm / 1.0059 in compared to 18.90 mm / 0.7441 in on the Yamaha AH-38D4 — a difference of 6.65 mm / 0.2618 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bob Reeves DR DINO and Yamaha AH-38D4?

The Yamaha AH-38D4 has a deep cup while the Bob Reeves DR DINO has a medium cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.

Bob Reeves DR DINO vs Yamaha AH-38D4

Name: Yamaha AH-38D4
Brand: Yamaha

The Bob Reeves DR DINO has a wider cup diameter, the Yamaha AH-38D4 features a deeper cup.

Overall Comparison Cup Diameter Cup Depth Rim Width Throat Diameter Backbore Finish Material

The narrowest point at the bottom of the cup. Affects resistance, volume, and tone color.

Mouthpiece A

Bob Reeves DR DINO

• Baritone / Euphonium

Throat diameter—

Mouthpiece B

Yamaha AH-38D4

• Baritone / Euphonium

Throat diameter5.25 mm / 0.2067 in

Best suited for

🎻Orchestral playing — large cup for full, dark tone

📣High-volume projection — open throat for power

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.

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Bob Reeves DR DINO vs Yamaha AH-38D4

Playing Characteristics

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