Home › Trombone › Bach 9 vs Giardinelli 6D

Bach 9 vs Giardinelli 6D

The Bach 9 has a wider cup diameter, the Giardinelli 6D has a larger throat opening.

Overall Comparison Cup Diameter Cup Depth Rim Width Throat Diameter Backbore Finish Material
Mouthpiece A
    Bach 9
    • Trombone
    Cup diameter24.72 mm / 0.9732 in
    Cup depthDeep
    Rim width—
    Throat diameter5.85 mm / 0.2303 in
    Backbore—
    Finish—
    Material—
    Best suited for
    🎻Orchestral playing — large cup for full, dark tone
    📣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

      The Bach 9 has a cup diameter of 24.72 mm / 0.9732 in compared to 24.50 mm / 0.9646 in on the Giardinelli 6D — a difference of 0.22 mm / 0.0087 in. A wider cup generally produces a fuller, darker tone but requires more air support.

      Cup Depth

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

      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 9 details Giardinelli 6D details Bach 9 equivalents Giardinelli 6D equivalents

      Compare Bach 9 with others

      Compare Giardinelli 6D with others

      Popular Trombone comparisons

      Bach vs Giardinelli

      Browse by specification