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Bach 12E vs Denis Wick 9BS

The Denis Wick 9BS has a wider cup diameter, the Denis Wick 9BS features a deeper cup, the Denis Wick 9BS 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 12E
    • Trombone
    Throat diameter5.85 mm / 0.2303 in
    Best suited for
    📣High-volume projection — open throat for power
    vs
    Mouthpiece B
      Denis Wick 9BS
      • Trombone
      Throat diameter6.66 mm / 0.2622 in
      Best suited for
      📣High-volume projection — open throat for power

      Throat Diameter

      The Denis Wick 9BS has a wider throat (6.66 mm / 0.2622 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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