Bach 12C vs Schilke 58
The Schilke 58 has a wider cup diameter, the Schilke 58 features a deeper cup, the Schilke 58 has a larger throat opening.
The taper behind the throat leading to the shank. Affects projection and tone character.
Mouthpiece A
Bach 12C
• Trombone
Backbore—
Best suited for
High-volume projection — open throat for power
vs
Mouthpiece B
Schilke 58
• Trombone
Backbore19/64.2969"
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.