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Bach 12E vs Bruno Tilz 306-3

The Bruno Tilz 306-3 has a wider cup diameter, the Bruno Tilz 306-3 features a deeper cup, the Bruno Tilz 306-3 has a larger throat opening.

Overall Comparison Cup Diameter Cup Depth Rim Width Throat Diameter Backbore Finish Material
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
    Bach 12E
    • Trombone
    Cup diameter24.50 mm / 0.9646 in
    Best suited for
    📣High-volume projection — open throat for power
    vs
    Mouthpiece B
      Bruno Tilz 306-3
      • Trombone
      Catalog
      Cup diameter27.00 mm / 1.0630 in
      Best suited for
      📣High-volume projection — open throat for power

      Cup Diameter

      The Bruno Tilz 306-3 has a cup diameter of 27.00 mm / 1.0630 in compared to 24.50 mm / 0.9646 in on the Bach 12E — a difference of 2.50 mm / 0.0984 in. A wider cup generally produces a fuller, darker tone but requires more air support.

      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 306-3 details Bach 12E equivalents Bruno Tilz 306-3 equivalents

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