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Bach 9A vs Kelly 6V

The Bach 9A has a wider cup diameter, the Kelly 6V features a deeper cup, the Kelly 6V 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 9A
    • Cornet
    Cup diameter16.05 mm / 0.6319 in
    vs
    Mouthpiece B
      Kelly 6V
      • Cornet
      Dark/Deep
      Cup diameter16.00 mm / 0.6299 in
      Best suited for
      📣High-volume projection — open throat for power
      📋Deep V-cup to fill out cornet sound

      Cup Diameter

      The Bach 9A has a cup diameter of 16.05 mm / 0.6319 in compared to 16.00 mm / 0.6299 in on the Kelly 6V — a difference of 0.05 mm / 0.0020 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 9A details Kelly 6V details Bach 9A equivalents Kelly 6V equivalents

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