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Bach 12C vs Giardinelli 1GM

The Giardinelli 1GM has a wider cup diameter, the Giardinelli 1GM features a deeper cup, the Giardinelli 1GM 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 12C
    • Trombone
    Cup diameter24.50 mm / 0.9646 in
    Best suited for
    📣High-volume projection — open throat for power
    vs
    Mouthpiece B
      Giardinelli 1GM
      • Trombone
      Cup diameter27.00 mm / 1.0630 in
      Best suited for
      🎻Orchestral playing — large cup for full, dark tone
      📣High-volume projection — open throat for power

      Cup Diameter

      The Giardinelli 1GM has a cup diameter of 27.00 mm / 1.0630 in compared to 24.50 mm / 0.9646 in on the Bach 12C — a difference of 2.50 mm / 0.0984 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 12C details Giardinelli 1GM details Bach 12C equivalents Giardinelli 1GM equivalents

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