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Bach 5 vs Kelly 5G-EU-SS

The Bach 5 has a wider cup diameter, the Kelly 5G-EU-SS features a deeper cup.

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 5
    • Baritone / Euphonium
    Cup diameter25.50 mm / 1.0039 in
    Best suited for
    📣High-volume projection — open throat for power
    vs
    Mouthpiece B
      Kelly 5G-EU-SS
      • Baritone / Euphonium
      General
      Cup diameter25.40 mm / 1.0000 in
      Best suited for
      🎻Orchestral playing — large cup for full, dark tone
      📋Euphonium general use

      Cup Diameter

      The Bach 5 has a cup diameter of 25.50 mm / 1.0039 in compared to 25.40 mm / 1.0000 in on the Kelly 5G-EU-SS — 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 5 details Kelly 5G-EU-SS details Bach 5 equivalents Kelly 5G-EU-SS equivalents

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