Which has a bigger cup — Bach 12C or Yamaha AH-37C4?

The Bach 12C has a cup diameter of 24.50 mm / 0.9646 in compared to 18.60 mm / 0.7323 in on the Yamaha AH-37C4 — a difference of 5.90 mm / 0.2323 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bach 12C and Yamaha AH-37C4?

The Yamaha AH-37C4 has a medium cup while the Bach 12C has a shallow cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.

Bach 12C vs Yamaha AH-37C4

Name: Yamaha AH-37C4
Brand: Yamaha

The Bach 12C has a wider cup diameter, the Yamaha AH-37C4 features a deeper cup, the Bach 12C has a larger throat opening.

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

Base metal or construction (e.g. brass, stainless steel, plastic). Influences weight, response, and tone color.

Mouthpiece A

Bach 12C

• Baritone / Euphonium

Material—

Best suited for

📣High-volume projection — open throat for power

Mouthpiece B

Yamaha AH-37C4

• Baritone / Euphonium

Material—

Best suited for

📣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.

Open in interactive tool + Add third mouthpiece Bach 12C details Yamaha AH-37C4 details Bach 12C equivalents Yamaha AH-37C4 equivalents

Bach 12C vs Yamaha AH-37C4

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