Which has a bigger cup — Bach 15CW or Yamaha AH-38D4?

The Bach 15CW has a cup diameter of 24.40 mm / 0.9606 in compared to 18.90 mm / 0.7441 in on the Yamaha AH-38D4 — a difference of 5.50 mm / 0.2165 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bach 15CW and Yamaha AH-38D4?

The Yamaha AH-38D4 has a deep cup while the Bach 15CW has a shallow cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.

Bach 15CW vs Yamaha AH-38D4

Name: Yamaha AH-38D4
Brand: Yamaha

The Bach 15CW has a wider cup diameter, the Yamaha AH-38D4 features a deeper cup, the Bach 15CW has a larger throat opening.

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

The taper behind the throat leading to the shank. Affects projection and tone character.

Mouthpiece A

Bach 15CW

• Baritone / Euphonium

Backbore—

Best suited for

📣High-volume projection — open throat for power

Mouthpiece B

Yamaha AH-38D4

• Baritone / Euphonium

BackboreStandard

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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Bach 15CW vs Yamaha AH-38D4

Playing Characteristics

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