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Bach 12C vs Denis Wick 4AL

The Denis Wick 4AL has a wider cup diameter, the Denis Wick 4AL features a deeper cup, the Denis Wick 4AL has a larger throat opening.

Overall Comparison Cup Diameter Cup Depth Rim Width Throat Diameter Backbore Finish Material
The narrowest point at the bottom of the cup. Affects resistance, volume, and tone color.
Mouthpiece A
    Bach 12C
    • Trombone
    Throat diameter5.85 mm / 0.2303 in
    Best suited for
    📣High-volume projection — open throat for power
    vs
    Mouthpiece B
      Denis Wick 4AL
      • Trombone
      Throat diameter7.38 mm / 0.2906 in
      Best suited for
      🎻Orchestral playing — large cup for full, dark tone
      📣High-volume projection — open throat for power

      Throat Diameter

      The Denis Wick 4AL has a wider throat (7.38 mm / 0.2906 in vs 5.85 mm / 0.2303 in). A wider throat allows more air through, increasing volume and projection but reducing resistance.

      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.

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