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Bach 12E vs Marcinkiewicz ET1B. PeeblesBass Shank Only

The Marcinkiewicz ET1B. PeeblesBass Shank Only has a wider cup diameter, the Bach 12E features a deeper cup, the Marcinkiewicz ET1B. PeeblesBass Shank Only has a larger throat opening.

Overall Comparison Cup Diameter Cup Depth Rim Width Throat Diameter Backbore Finish Material
Mouthpiece A
    Bach 12E
    • 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
      Marcinkiewicz ET1B. PeeblesBass Shank Only
      • Trombone
      Cup diameter26.14 mm / 1.0291 in
      Cup depthVery shallow
      Rim width—
      Throat diameter6.76 mm / 0.2661 in
      Backbore—
      Finish—
      Material—
      Best suited for
      📣High-volume projection — open throat for power

      Cup Diameter

      The Marcinkiewicz ET1B. PeeblesBass Shank Only has a cup diameter of 26.14 mm / 1.0291 in compared to 24.50 mm / 0.9646 in on the Bach 12E — a difference of 1.64 mm / 0.0646 in. A wider cup generally produces a fuller, darker tone but requires more air support.

      Cup Depth

      The Bach 12E has a shallow cup while the Marcinkiewicz ET1B. PeeblesBass Shank Only has a very shallow cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.

      Throat Diameter

      The Marcinkiewicz ET1B. PeeblesBass Shank Only has a wider throat (6.76 mm / 0.2661 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 Marcinkiewicz ET1B. PeeblesBass Shank Only details Bach 12E equivalents Marcinkiewicz ET1B. PeeblesBass Shank Only equivalents

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