Which has a bigger cup — Kelly MC or Marcinkiewicz CH R 17S?

The Marcinkiewicz CH R 17S has a cup diameter of 17.42 mm / 0.6858 in compared to 16.76 mm / 0.6598 in on the Kelly MC — 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 MC and Marcinkiewicz CH R 17S?

Both mouthpieces share a very deep cup depth, so the sound character from depth alone will be very similar.

Kelly MC vs Marcinkiewicz CH R 17S

Name: Marcinkiewicz CH R 17S
Brand: Marcinkiewicz

The Marcinkiewicz CH R 17S has a wider cup diameter, the Marcinkiewicz CH R 17S has a larger throat opening.

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

Surface plating or treatment (e.g. silver plate, gold trim). Affects feel, durability, and appearance.

Mouthpiece A

Kelly MC

• French Horn

General

Finish—

Best suited for

📣High-volume projection — open throat for power

📋All-purpose French horn

Mouthpiece B

Marcinkiewicz CH R 17S

• French Horn

Finish—

Best suited for

🎻Orchestral playing — large cup for full, dark tone

📣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.

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Kelly MC vs Marcinkiewicz CH R 17S

Playing Characteristics

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What Changes If You Switch?

Which is better?

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