Bach 22 vs Yamaha AH-37C4
The Bach 22 has a wider cup diameter, the Bach 22 has a larger throat opening.
Mouthpiece A
Bach 22
• Baritone / Euphonium
Cup diameter23.92 mm
Cup depthMedium
Rim width—
Throat diameter5.85 mm
Backbore—
Finish—
Material—
Best suited for
High-volume projection — open throat for power
vs
Mouthpiece B
Yamaha AH-37C4
• Baritone / Euphonium
Cup diameter18.60 mm
Cup depthMedium
Rim width—
Throat diameter5.25 mm
BackboreStandard
Finish—
Material—
Best suited for
High-volume projection — open throat for power
Cup Diameter
The Bach 22 has a cup diameter of 23.92 mm compared to 18.60 mm on the Yamaha AH-37C4 — a difference of +5.32 mm. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
Both mouthpieces share a medium cup depth, so the sound character from depth alone will be very similar.
Throat Diameter
The Bach 22 has a wider throat (5.85 mm vs 5.25 mm). A wider throat allows more air through, increasing volume and projection but reducing resistance.
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.