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Bach 4C vs Bach 6½AL (large shank)

The Bach 4C has a wider cup diameter, the Bach 6½AL (large shank) features a deeper cup, the Bach 6½AL (large shank) has a larger throat opening.

Overall Comparison Cup Diameter Cup Depth Rim Width Throat Diameter Backbore Finish Material
How deep the cup is, from shallow (brighter, easier high register) to deep (darker, fuller sound).
Mouthpiece A
    Bach 4C
    • Trombone
    Cup depthShallow
    Best suited for
    📣High-volume projection — open throat for power
    vs
    Mouthpiece B
      Bach 6½AL (large shank)
      • Trombone
      Cup depthDeep
      Best suited for
      🎻Orchestral playing — large cup for full, dark tone
      📣High-volume projection — open throat for power

      Cup Depth

      The Bach 6½AL (large shank) has a deep cup while the Bach 4C has a shallow cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.

      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 4C details Bach 6½AL (large shank) details Bach 4C equivalents Bach 6½AL (large shank) equivalents

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