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Bach 4G vs Denis Wick 6BL

The Bach 4G has a wider cup diameter, the Bach 4G features a deeper cup, the Bach 4G 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 4G
    • Trombone
    Cup diameter26.00 mm / 1.0236 in
    Best suited for
    🎻Orchestral playing — large cup for full, dark tone
    📣High-volume projection — open throat for power
    vs
    Mouthpiece B
      Denis Wick 6BL
      • Trombone
      Cup diameter25.40 mm / 1.0000 in
      Best suited for
      📣High-volume projection — open throat for power

      Cup Diameter

      The Bach 4G has a cup diameter of 26.00 mm / 1.0236 in compared to 25.40 mm / 1.0000 in on the Denis Wick 6BL — a difference of 0.60 mm / 0.0236 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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