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Bach 17C vs Bach 17D

Both mouthpieces share similar core dimensions — the differences are in the details.

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 17C
    • Trombone
    Cup diameter24.20 mm / 0.9528 in
    Best suited for
    📣High-volume projection — open throat for power
    vs
    Mouthpiece B
      Bach 17D
      • Trombone
      Cup diameter24.20 mm / 0.9528 in
      Best suited for
      📣High-volume projection — open throat for power

      Cup Diameter

      Both mouthpieces have virtually identical cup diameters at 24.20 mm / 0.9528 in.

      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 17C details Bach 17D details Bach 17C equivalents Bach 17D equivalents

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