Yamaha SL-46BS 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.
How deep the cup is, from shallow (brighter, easier high register) to deep (darker, fuller sound).
Mouthpiece A
Yamaha SL-46BS
• Trombone
Cup depthShallow
Best suited for
High-volume projection — open throat for power
vs
Mouthpiece B
Yamaha SL-48S-GP
• Trombone
Cup depthMedium
Best suited for
High-volume projection — open throat for power
Cup Depth
The Yamaha SL-48S-GP has a medium cup while the Yamaha SL-46BS has a shallow cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
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.