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 width of the rim surface that contacts the lips. Wider rims improve endurance; narrower rims improve flexibility.

Mouthpiece A

Bob Reeves DR DINO

• Baritone / Euphonium

Rim width—

Mouthpiece B

Yamaha AH-38D4

• Baritone / Euphonium

Rim width—

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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