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Bach 12E vs Kelly 5G

The Kelly 5G has a wider cup diameter, the Kelly 5G features a deeper cup.

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 12E
    • Trombone
    Cup depthShallow
    Best suited for
    📣High-volume projection — open throat for power
    vs
    Mouthpiece B
      Kelly 5G
      • Trombone
      Orchestral
      Cup depth
      Best suited for
      🎻Orchestral playing — large cup for full, dark tone
      📋Symphonic trombone

      Cup Depth

      The Kelly 5G has a — cup while the Bach 12E 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 12E details Kelly 5G details Bach 12E equivalents Kelly 5G equivalents

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