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Bach 5 vs Bruno Tilz 305-5 GT

The Bruno Tilz 305-5 GT has a wider cup diameter, the Bruno Tilz 305-5 GT has a larger throat opening.

Overall Comparison Cup Diameter Cup Depth Rim Width Throat Diameter Backbore Finish Material
Mouthpiece A
    Bach 5
    • Trombone
    Cup diameter25.50 mm
    Cup depthMedium
    Rim width—
    Throat diameter5.85 mm
    Backbore—
    Finish—
    Material—
    Best suited for
    📣High-volume projection — open throat for power
    vs
    Mouthpiece B
      Bruno Tilz 305-5 GT
      • Trombone
      Catalog
      Cup diameter25.60 mm
      Cup depthMedium
      Rim width—
      Throat diameter6.80 mm
      Backbore—
      Finish—
      Material—
      Best suited for
      📣High-volume projection — open throat for power

      Cup Diameter

      The Bruno Tilz 305-5 GT has a cup diameter of 25.60 mm compared to 25.50 mm on the Bach 5 — a difference of +0.10 mm. A wider cup generally produces a fuller, darker tone but requires more air support.

      Cup Depth

      Both mouthpieces share a medium cup depth, so the sound character from depth alone will be very similar.

      Throat Diameter

      The Bruno Tilz 305-5 GT has a wider throat (6.80 mm vs 5.85 mm). 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.

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