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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
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
    Bach 12E
    • Trombone
    Cup diameter24.50 mm / 0.9646 in
    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
      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.

      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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