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

The taper behind the throat leading to the shank. Affects projection and tone character.

Mouthpiece A

Kelly 51D

• Trombone

Professional

BackboreL

Best suited for

🎻Orchestral playing — large cup for full, dark tone

📋Professional euphonium and trombone players

Mouthpiece B

Marcinkiewicz 8H-S

• Trombone

Backbore—

Best suited for

📣High-volume projection — open throat for power

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

Playing Characteristics

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