Which has a bigger cup — Yamaha SL-48L or Yamaha SL-54L?

The Yamaha SL-54L has a cup diameter of 26.15 mm / 1.0295 in compared to 25.25 mm / 0.9941 in on the Yamaha SL-48L — a difference of 0.90 mm / 0.0354 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Yamaha SL-48L and Yamaha SL-54L?

Both mouthpieces share a medium cup depth, so the sound character from depth alone will be very similar.

Yamaha SL-48L vs Yamaha SL-54L

Name: Yamaha SL-54L
Brand: Yamaha

The Yamaha SL-54L has a wider cup diameter, the Yamaha SL-54L has a larger throat opening.

Overall Comparison Cup Diameter Cup Depth Rim Width Throat Diameter Backbore Finish Material

The narrowest point at the bottom of the cup. Affects resistance, volume, and tone color.

Mouthpiece A

Yamaha SL-48L

• Trombone

Throat diameter6.62 mm / 0.2606 in

Best suited for

📣High-volume projection — open throat for power

Mouthpiece B

Yamaha SL-54L

• Trombone

Throat diameter7.11 mm / 0.2799 in

Best suited for

📣High-volume projection — open throat for power

Throat Diameter

The Yamaha SL-54L has a wider throat (7.11 mm / 0.2799 in vs 6.62 mm / 0.2606 in). A wider throat allows more air through, increasing volume and projection but reducing resistance.

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.

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Yamaha SL-48L vs Yamaha SL-54L

Throat Diameter

Playing Characteristics

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Which is better?

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