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Bach 12E vs Bach 5GS (large shank)

The Bach 5GS (large shank) has a wider cup diameter, the Bach 5GS (large shank) features a deeper cup, the Bach 5GS (large shank) has a larger throat opening.

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
      Bach 5GS (large shank)
      • Trombone
      Throat diameter6.63 mm / 0.2610 in
      Best suited for
      🎻Orchestral playing — large cup for full, dark tone
      📣High-volume projection — open throat for power

      Throat Diameter

      The Bach 5GS (large shank) has a wider throat (6.63 mm / 0.2610 in vs 5.85 mm / 0.2303 in). A wider throat allows more air through, increasing volume and projection but reducing resistance.

      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 Bach 5GS (large shank) details Bach 12E equivalents Bach 5GS (large shank) equivalents

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