Yamaha SL-48DL vs Yamaha SL-48S
the Yamaha SL-48DL features a deeper cup.
Mouthpiece A
Yamaha SL-48DL
• Trombone
Cup diameter25.25 mm / 0.9941 in
Cup depthDeep
Rim width—
Throat diameter6.62 mm / 0.2606 in
BackboreSemi-narrow
Finish—
Material—
Best suited for
Orchestral playing — large cup for full, dark tone
High-volume projection — open throat for power
vs
Mouthpiece B
Yamaha SL-48S
• Trombone
Cup diameter25.25 mm / 0.9941 in
Cup depthMedium
Rim width—
Throat diameter6.62 mm / 0.2606 in
BackboreSemi-wide
Finish—
Material—
Best suited for
High-volume projection — open throat for power
Cup Diameter
Both mouthpieces have virtually identical cup diameters at 25.25 mm / 0.9941 in.
Cup Depth
The Yamaha SL-48DL has a deep cup while the Yamaha SL-48S has a medium cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
Throat Diameter
Throat diameters are essentially identical at 6.62 mm / 0.2606 in, so resistance feel will be comparable.
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.