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Giardinelli Sym. B. vs Kelly 6-1/2AL

The Giardinelli Sym. B. has a wider cup diameter.

Overall Comparison Cup Diameter Cup Depth Rim Width Throat Diameter Backbore Finish Material
Mouthpiece A
    Giardinelli Sym. B.
    • Trombone
    Cup diameter26.70 mm
    Cup depthVery deep
    Rim width—
    Throat diameter7.15 mm
    Backbore9/32 (.281)"
    Finish—
    Material—
    Best suited for
    🎻Orchestral playing — large cup for full, dark tone
    📣High-volume projection — open throat for power
    vs
    Mouthpiece B
      Kelly 6-1/2AL
      • Trombone
      General
      Cup diameter25.15 mm
      Cup depthVery deep
      Rim width—
      Throat diameter—
      BackboreM
      Finish—
      MaterialLexan polycarbonate
      Best suited for
      🎻Orchestral playing — large cup for full, dark tone
      📋Standard trombone / baritone

      Cup Diameter

      The Giardinelli Sym. B. has a cup diameter of 26.70 mm compared to 25.15 mm on the Kelly 6-1/2AL — a difference of +1.55 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.

      Material

      The Giardinelli Sym. B. is described as unspecified, and the Kelly 6-1/2AL as Lexan polycarbonate. Material affects mass, warmth, and how quickly the piece responds.

      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 Giardinelli Sym. B. details Kelly 6-1/2AL details Giardinelli Sym. B. equivalents Kelly 6-1/2AL equivalents

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