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Bach 4G vs Bach 4GB

Both mouthpieces share similar core dimensions — the differences are in the details.

Overall Comparison Cup Diameter Cup Depth Rim Width Throat Diameter Backbore Finish Material
Mouthpiece A
    Bach 4G
    • Trombone
    Cup diameter26.00 mm / 1.0236 in
    Cup depthVery deep
    Rim width—
    Throat diameter7.01 mm / 0.2760 in
    Backbore—
    Finish—
    Material—
    Best suited for
    🎻Orchestral playing — large cup for full, dark tone
    📣High-volume projection — open throat for power
    vs
    Mouthpiece B
      Bach 4GB
      • Trombone
      Cup diameter26.00 mm / 1.0236 in
      Cup depthVery deep
      Rim width—
      Throat diameter7.01 mm / 0.2760 in
      Backbore—
      Finish—
      Material—
      Best suited for
      🎻Orchestral playing — large cup for full, dark tone
      📣High-volume projection — open throat for power

      Cup Diameter

      Both mouthpieces have virtually identical cup diameters at 26.00 mm / 1.0236 in.

      Cup Depth

      Both mouthpieces share a very deep cup depth, so the sound character from depth alone will be very similar.

      Throat Diameter

      Throat diameters are essentially identical at 7.01 mm / 0.2760 in, so resistance feel will be comparable.

      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 Bach 4G details Bach 4GB details Bach 4G equivalents Bach 4GB equivalents

      Compare Bach 4G with others

      Compare Bach 4GB with others

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