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Bach 18C vs Bach 22D

The Bach 18C has a wider cup diameter.

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 18C
    • Trombone
    Cup diameter24.20 mm / 0.9528 in
    Best suited for
    📣High-volume projection — open throat for power
    vs
    Mouthpiece B
      Bach 22D
      • Trombone
      Cup diameter23.92 mm / 0.9417 in
      Best suited for
      📣High-volume projection — open throat for power

      Cup Diameter

      The Bach 18C has a cup diameter of 24.20 mm / 0.9528 in compared to 23.92 mm / 0.9417 in on the Bach 22D — a difference of 0.28 mm / 0.0110 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 18C details Bach 22D details Bach 18C equivalents Bach 22D equivalents

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