Bach 18C vs Bach 18D
Both mouthpieces share similar core dimensions — the differences are in the details.
The taper behind the throat leading to the shank. Affects projection and tone character.
Mouthpiece A
Bach 18C
• Baritone / Euphonium
Backbore—
Best suited for
High-volume projection — open throat for power
vs
Mouthpiece B
Bach 18D
• Baritone / Euphonium
Backbore—
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.