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Bach 2½C vs Conn Precision 1

The Conn Precision 1 has a wider cup diameter, the Conn Precision 1 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 2½C
    • Cornet
    Cup diameter16.40 mm / 0.6457 in
    Best suited for
    🎵All-round versatile — balanced cup for general playing
    vs
    Mouthpiece B
      Conn Precision 1
      • Cornet
      General
      Cup diameter16.56 mm / 0.6520 in
      Best suited for
      📋All-around players; comfortable wide rim
      🎶Full round tone; suited to low notes

      Cup Diameter

      The Conn Precision 1 has a cup diameter of 16.56 mm / 0.6520 in compared to 16.40 mm / 0.6457 in on the Bach 2½C — a difference of 0.16 mm / 0.0063 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.

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