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Bob Reeves 4G/JF vs Denis Wick 6BS

The Bob Reeves 4G/JF has a wider cup diameter, the Bob Reeves 4G/JF features a deeper cup.

Overall Comparison Cup Diameter Cup Depth Rim Width Throat Diameter Backbore Finish Material
Mouthpiece A
    Bob Reeves 4G/JF
    • Trombone
    Cup diameter26.00 mm
    Cup depthDeep
    Rim width—
    Throat diameter—
    Backbore—
    Finish—
    Material—
    Best suited for
    🎻Orchestral playing — large cup for full, dark tone
    vs
    Mouthpiece B
      Denis Wick 6BS
      • Trombone
      Cup diameter25.40 mm
      Cup depthMedium
      Rim width6.26 mm
      Throat diameter6.66 mm
      BackboreV-type
      Finish—
      Material—
      Best suited for
      📣High-volume projection — open throat for power

      Cup Diameter

      The Bob Reeves 4G/JF has a cup diameter of 26.00 mm compared to 25.40 mm on the Denis Wick 6BS — a difference of +0.60 mm. A wider cup generally produces a fuller, darker tone but requires more air support.

      Cup Depth

      The Bob Reeves 4G/JF has a deep cup while the Denis Wick 6BS has a medium 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 Bob Reeves 4G/JF details Denis Wick 6BS details Bob Reeves 4G/JF equivalents Denis Wick 6BS equivalents

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