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Bach 12C vs Bach Mega Tone Trombone 4

The Bach Mega Tone Trombone 4 has a wider cup diameter, the Bach Mega Tone Trombone 4 features a deeper cup.

Overall Comparison Cup Diameter Cup Depth Rim Width Throat Diameter Backbore Finish Material
Mouthpiece A
    Bach 12C
    • Trombone
    Cup diameter24.50 mm / 0.9646 in
    Cup depthShallow
    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 Mega Tone Trombone 4
      • Trombone
      Cup diameter26.00 mm / 1.0236 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

      Cup Diameter

      The Bach Mega Tone Trombone 4 has a cup diameter of 26.00 mm / 1.0236 in compared to 24.50 mm / 0.9646 in on the Bach 12C — a difference of 1.50 mm / 0.0591 in. A wider cup generally produces a fuller, darker tone but requires more air support.

      Cup Depth

      The Bach Mega Tone Trombone 4 has a medium cup while the Bach 12C has a shallow 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 12C details Bach Mega Tone Trombone 4 details Bach 12C equivalents Bach Mega Tone Trombone 4 equivalents

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