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Bach 5 vs Yamaha SL-48S-GP

The Bach 5 has a wider cup diameter, the Yamaha SL-48S-GP has a larger throat opening.

Overall Comparison Cup Diameter Cup Depth Rim Width Throat Diameter Backbore Finish Material
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
    Bach 5
    • Trombone
    Cup diameter25.50 mm / 1.0039 in
    Best suited for
    📣High-volume projection — open throat for power
    vs
    Mouthpiece B
      Yamaha SL-48S-GP
      • Trombone
      Cup diameter25.25 mm / 0.9941 in
      Best suited for
      📣High-volume projection — open throat for power

      Cup Diameter

      The Bach 5 has a cup diameter of 25.50 mm / 1.0039 in compared to 25.25 mm / 0.9941 in on the Yamaha SL-48S-GP — a difference of 0.25 mm / 0.0098 in. A wider cup generally produces a fuller, darker tone but requires more air support.

      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.

      Open in interactive tool + Add third mouthpiece Bach 5 details Yamaha SL-48S-GP details Bach 5 equivalents Yamaha SL-48S-GP equivalents

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