Home › Trombone › Bach 12C vs Giardinelli 5M

Bach 12C vs Giardinelli 5M

The Giardinelli 5M has a wider cup diameter, the Giardinelli 5M features a deeper cup, the Giardinelli 5M 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 5M
      • Trombone
      Cup diameter25.00 mm / 0.9843 in
      Best suited for
      📣High-volume projection — open throat for power

      Cup Diameter

      The Giardinelli 5M has a cup diameter of 25.00 mm / 0.9843 in compared to 24.50 mm / 0.9646 in on the Bach 12C — a difference of 0.50 mm / 0.0197 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 5M details Bach 12C equivalents Giardinelli 5M equivalents

      Compare Bach 12C with others

      Compare Giardinelli 5M with others

      Popular Trombone comparisons

      Bach vs Giardinelli

      Browse by specification