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Bach 12C vs Giardinelli 6D

the Giardinelli 6D features a deeper cup, the Giardinelli 6D has a larger throat opening.

Overall Comparison Cup Diameter Cup Depth Rim Width Throat Diameter Backbore Finish Material
Mouthpiece A
    Bach 12C
    • Trombone
    Cup diameter24.50 mm / 0.9646 in
    Cup depthShallow
    Rim width—
    Throat diameter5.85 mm / 0.2303 in
    Backbore—
    Finish—
    Material—
    Best suited for
    📣High-volume projection — open throat for power
    vs
    Mouthpiece B
      Giardinelli 6D
      • Trombone
      Cup diameter24.50 mm / 0.9646 in
      Cup depthDeep
      Rim width—
      Throat diameter6.00 mm / 0.2362 in
      Backbore15/64" (.234)
      Finish—
      Material—
      Best suited for
      🎻Orchestral playing — large cup for full, dark tone
      📣High-volume projection — open throat for power

      Cup Diameter

      Both mouthpieces have virtually identical cup diameters at 24.50 mm / 0.9646 in.

      Cup Depth

      The Giardinelli 6D has a deep cup while the Bach 12C has a shallow cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.

      Throat Diameter

      The Giardinelli 6D has a wider throat (6.00 mm / 0.2362 in vs 5.85 mm / 0.2303 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.

      Open in interactive tool + Add third mouthpiece Bach 12C details Giardinelli 6D details Bach 12C equivalents Giardinelli 6D equivalents

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