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Bach 12E vs Bruno Tilz 305-A 1 1/2

the Bach 12E features a deeper cup, the Bach 12E has a larger throat opening.

Overall Comparison Cup Diameter Cup Depth Rim Width Throat Diameter Backbore Finish Material
Mouthpiece A
    Bach 12E
    • 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
      Bruno Tilz 305-A 1 1/2
      • Trombone
      Catalog
      Cup diameter24.50 mm / 0.9646 in
      Cup depthVery shallow
      Rim width—
      Throat diameter5.20 mm / 0.2047 in
      Backbore—
      Finish—
      Material—
      Best suited for
      📣High-volume projection — open throat for power

      Cup Diameter

      Both mouthpieces have virtually identical cup diameters at 24.50 mm / 0.9646 in.

      Cup Depth

      The Bach 12E has a shallow cup while the Bruno Tilz 305-A 1 1/2 has a very shallow cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.

      Throat Diameter

      The Bach 12E has a wider throat (5.85 mm / 0.2303 in vs 5.20 mm / 0.2047 in). A wider throat allows more air through, increasing volume and projection but reducing resistance.

      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 12E details Bruno Tilz 305-A 1 1/2 details Bach 12E equivalents Bruno Tilz 305-A 1 1/2 equivalents

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