Bach 8 vs Yamaha AH-37C4
The Bach 8 has a wider cup diameter, the Bach 8 has a larger throat opening.
The narrowest point at the bottom of the cup. Affects resistance, volume, and tone color.
Mouthpiece A
Bach 8
• Baritone / Euphonium
Throat diameter5.85 mm / 0.2303 in
Best suited for
High-volume projection — open throat for power
vs
Mouthpiece B
Yamaha AH-37C4
• Baritone / Euphonium
Throat diameter5.25 mm / 0.2067 in
Best suited for
High-volume projection — open throat for power
Throat Diameter
The Bach 8 has a wider throat (5.85 mm / 0.2303 in vs 5.25 mm / 0.2067 in). 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.