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Bach 12C vs Denis Wick 9BL

The Denis Wick 9BL has a wider cup diameter, the Denis Wick 9BL features a deeper cup, the Denis Wick 9BL has a larger throat opening.

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 12C
    • Trombone
    Cup diameter24.50 mm / 0.9646 in
    Best suited for
    📣High-volume projection — open throat for power
    vs
    Mouthpiece B
      Denis Wick 9BL
      • Trombone
      Cup diameter25.00 mm / 0.9843 in
      Best suited for
      📣High-volume projection — open throat for power

      Cup Diameter

      The Denis Wick 9BL has a cup diameter of 25.00 mm / 0.9843 in compared to 24.50 mm / 0.9646 in on the Bach 12C — a difference of 0.50 mm / 0.0197 in. A wider cup generally produces a fuller, darker tone but requires more air support.

      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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