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Bach 12E vs Conn Precision 3A

the Conn Precision 3A features a deeper cup.

Overall Comparison Cup Diameter Cup Depth Rim Width Throat Diameter Backbore Finish Material
The narrowest point at the bottom of the cup. Affects resistance, volume, and tone color.
Mouthpiece A
    Bach 12E
    • Trombone
    Throat diameter5.85 mm / 0.2303 in
    Best suited for
    📣High-volume projection — open throat for power
    vs
    Mouthpiece B
      Conn Precision 3A
      • Trombone
      General
      Throat diameter—
      Best suited for
      📋General trombone use
      🎶Good round tone in all registers; all-around

      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 12E details Conn Precision 3A details Bach 12E equivalents Conn Precision 3A equivalents

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