Bach 15D vs Yamaha SL-48S-GP
The Yamaha SL-48S-GP has a wider cup diameter, the Yamaha SL-48S-GP features a deeper cup, the Yamaha SL-48S-GP has a larger throat opening.
The taper behind the throat leading to the shank. Affects projection and tone character.
Mouthpiece A
Bach 15D
• Trombone
Backbore—
Best suited for
High-volume projection — open throat for power
vs
Mouthpiece B
Yamaha SL-48S-GP
• Trombone
BackboreSemi-wide
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.