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Bach 12C vs Conn Imp. Precision 4

the Conn Imp. Precision 4 features a deeper cup.

Overall Comparison Cup Diameter Cup Depth Rim Width Throat Diameter Backbore Finish Material
Mouthpiece A
    Bach 12C
    • Trombone
    Cup diameter24.50 mm / 0.9646 in
    Cup depthShallow
    Rim width—
    Throat diameter5.85 mm / 0.2303 in
    Backbore—
    Finish—
    Material—
    Best suited for
    📣High-volume projection — open throat for power
    vs
    Mouthpiece B
      Conn Imp. Precision 4
      • Trombone
      Orchestral
      Cup diameter—
      Cup depth
      Rim width—
      Throat diameter—
      Backbore—
      Finish—
      MaterialSilver-plated brass
      Best suited for
      📋Bass trombone / large bore tenor
      🎶Full rich deep tone

      Cup Depth

      The Conn Imp. Precision 4 has a — cup while the Bach 12C has a shallow cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.

      Material

      The Bach 12C is described as unspecified, and the Conn Imp. Precision 4 as Silver-plated brass. Material affects mass, warmth, and how quickly the piece responds.

      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 12C details Conn Imp. Precision 4 details Bach 12C equivalents Conn Imp. Precision 4 equivalents

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