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Bach 1¼G vs Conn Imp. Precision 5

Both mouthpieces share similar core dimensions — the differences are in the details.

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 1¼G
    • Trombone
    Cup diameter27.50 mm / 1.0827 in
    Best suited for
    🎻Orchestral playing — large cup for full, dark tone
    📣High-volume projection — open throat for power
    vs
    Mouthpiece B
      Conn Imp. Precision 5
      • Trombone
      General
      Cup diameter—
      Best suited for
      📋Connstellation-equipped tenor trombone
      🎶Designed for Connstellation 24I/25I

      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 1¼G details Conn Imp. Precision 5 details Bach 1¼G equivalents Conn Imp. Precision 5 equivalents

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