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Bach 12E vs Yamaha SL-47S

The Yamaha SL-47S has a wider cup diameter, the Yamaha SL-47S features a deeper cup.

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 12E
    • Trombone
    Cup diameter24.50 mm / 0.9646 in
    Best suited for
    📣High-volume projection — open throat for power
    vs
    Mouthpiece B
      Yamaha SL-47S
      • Trombone
      Cup diameter24.98 mm / 0.9835 in
      Best suited for
      📣High-volume projection — open throat for power

      Cup Diameter

      The Yamaha SL-47S has a cup diameter of 24.98 mm / 0.9835 in compared to 24.50 mm / 0.9646 in on the Bach 12E — a difference of 0.48 mm / 0.0189 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 12E details Yamaha SL-47S details Bach 12E equivalents Yamaha SL-47S equivalents

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