Which has a bigger cup — Kelly 51D or Marcinkiewicz 8H-S?

The Marcinkiewicz 8H-S has a cup diameter of 26.06 mm / 1.0260 in compared to 25.40 mm / 1.0000 in on the Kelly 51D — a difference of 0.66 mm / 0.0260 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Kelly 51D and Marcinkiewicz 8H-S?

The Kelly 51D has a — cup while the Marcinkiewicz 8H-S has a shallow cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.

Kelly 51D vs Marcinkiewicz 8H-S

Name: Marcinkiewicz 8H-S
Brand: Marcinkiewicz

The Marcinkiewicz 8H-S has a wider cup diameter, the Kelly 51D features a deeper cup.

Overall Comparison Cup Diameter Cup Depth Rim Width Throat Diameter Backbore Finish Material

Base metal or construction (e.g. brass, stainless steel, plastic). Influences weight, response, and tone color.

Mouthpiece A

Kelly 51D

• Trombone

Professional

MaterialLexan polycarbonate

Best suited for

🎻Orchestral playing — large cup for full, dark tone

📋Professional euphonium and trombone players

Mouthpiece B

Marcinkiewicz 8H-S

• Trombone

Material—

Best suited for

📣High-volume projection — open throat for power

Material

The Kelly 51D is described as Lexan polycarbonate, and the Marcinkiewicz 8H-S as unspecified. 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 Kelly 51D details Marcinkiewicz 8H-S details Kelly 51D equivalents Marcinkiewicz 8H-S equivalents

Kelly 51D vs Marcinkiewicz 8H-S

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