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Bach 15CW vs Bruno Tilz 305-D 1

The Bruno Tilz 305-D 1 has a wider cup diameter, the Bach 15CW 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 15CW
    • Trombone
    Cup diameter24.40 mm / 0.9606 in
    Best suited for
    📣High-volume projection — open throat for power
    vs
    Mouthpiece B
      Bruno Tilz 305-D 1
      • Trombone
      Catalog
      Cup diameter24.50 mm / 0.9646 in
      Best suited for
      📣High-volume projection — open throat for power

      Cup Diameter

      The Bruno Tilz 305-D 1 has a cup diameter of 24.50 mm / 0.9646 in compared to 24.40 mm / 0.9606 in on the Bach 15CW — a difference of 0.10 mm / 0.0039 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 15CW details Bruno Tilz 305-D 1 details Bach 15CW equivalents Bruno Tilz 305-D 1 equivalents

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