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Bach 8 vs Bach 9

The Bach 8 has a wider cup diameter, the Bach 9 features a deeper cup.

Overall Comparison Cup Diameter Cup Depth Rim Width Throat Diameter Backbore Finish Material
Mouthpiece A
    Bach 8
    • Trombone
    Cup diameter24.75 mm / 0.9744 in
    Cup depthMedium
    Rim width—
    Throat diameter5.85 mm / 0.2303 in
    Backbore—
    Finish—
    Material—
    Best suited for
    📣High-volume projection — open throat for power
    vs
    Mouthpiece B
      Bach 9
      • Trombone
      Cup diameter24.72 mm / 0.9732 in
      Cup depthDeep
      Rim width—
      Throat diameter5.85 mm / 0.2303 in
      Backbore—
      Finish—
      Material—
      Best suited for
      🎻Orchestral playing — large cup for full, dark tone
      📣High-volume projection — open throat for power

      Cup Diameter

      The Bach 8 has a cup diameter of 24.75 mm / 0.9744 in compared to 24.72 mm / 0.9732 in on the Bach 9 — a difference of 0.03 mm / 0.0012 in. A wider cup generally produces a fuller, darker tone but requires more air support.

      Cup Depth

      The Bach 9 has a deep cup while the Bach 8 has a medium cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.

      Throat Diameter

      Throat diameters are essentially identical at 5.85 mm / 0.2303 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 8 details Bach 9 details Bach 8 equivalents Bach 9 equivalents

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