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Bach 4G vs Yamaha SL-TRUDEL-S

The Bach 4G has a wider cup diameter, the Yamaha SL-TRUDEL-S has a larger throat opening.

Overall Comparison Cup Diameter Cup Depth Rim Width Throat Diameter Backbore Finish Material
Mouthpiece A
    Bach 4G
    • Trombone
    Cup diameter26.00 mm
    Cup depthVery deep
    Rim width—
    Throat diameter7.01 mm
    Backbore—
    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-TRUDEL-S
      • Trombone
      Cup diameter25.23 mm
      Cup depthVery deep
      Rim width—
      Throat diameter7.15 mm
      BackboreNarrow
      Finish—
      Material—
      Best suited for
      🎻Orchestral playing — large cup for full, dark tone
      📣High-volume projection — open throat for power

      Cup Diameter

      The Bach 4G has a cup diameter of 26.00 mm compared to 25.23 mm on the Yamaha SL-TRUDEL-S — a difference of +0.77 mm. A wider cup generally produces a fuller, darker tone but requires more air support.

      Cup Depth

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

      Throat Diameter

      The Yamaha SL-TRUDEL-S has a wider throat (7.15 mm vs 7.01 mm). 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.

      Open in interactive tool + Add third mouthpiece Bach 4G details Yamaha SL-TRUDEL-S details Bach 4G equivalents Yamaha SL-TRUDEL-S equivalents

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