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Bruno Tilz 211-TS 6 vs Kelly 31

The Bruno Tilz 211-TS 6 has a wider cup diameter, the Kelly 31 features a deeper cup, the Bruno Tilz 211-TS 6 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
    Bruno Tilz 211-TS 6
    • French Horn
    Catalog
    Cup diameter18.50 mm / 0.7283 in
    Best suited for
    🎻Orchestral playing — large cup for full, dark tone
    📣High-volume projection — open throat for power
    vs
    Mouthpiece B
      Kelly 31
      • French Horn
      General
      Cup diameter17.53 mm / 0.6902 in
      Best suited for
      🎻Orchestral playing — large cup for full, dark tone
      📣High-volume projection — open throat for power
      📋French horn deep cup

      Cup Diameter

      The Bruno Tilz 211-TS 6 has a cup diameter of 18.50 mm / 0.7283 in compared to 17.53 mm / 0.6902 in on the Kelly 31 — a difference of 0.97 mm / 0.0382 in. A wider cup generally produces a fuller, darker tone but requires more air support.

      Which is better?

      The Bruno Tilz 211-TS 6 is designed for catalog playing, while the Kelly 31 targets general use. Your best choice depends on your musical context.

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