Which has a bigger cup — Bach 6½AL (small shank) or Yamaha AH-38D4?

The Bach 6½AL (small shank) has a cup diameter of 25.40 mm / 1.0000 in compared to 18.90 mm / 0.7441 in on the Yamaha AH-38D4 — a difference of 6.50 mm / 0.2559 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bach 6½AL (small shank) and Yamaha AH-38D4?

Both mouthpieces share a deep cup depth, so the sound character from depth alone will be very similar.

Bach 6½AL (small shank) vs Yamaha AH-38D4

Name: Yamaha AH-38D4
Brand: Yamaha

The Bach 6½AL (small shank) has a wider cup diameter, the Bach 6½AL (small shank) 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 6½AL (small shank)

• Baritone / Euphonium

Backbore—

Best suited for

🎻Orchestral playing — large cup for full, dark tone

📣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 6½AL (small shank) vs Yamaha AH-38D4

Playing Characteristics

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Which is better?

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