Which has a bigger cup — Kelly 7C or Marcinkiewicz 2S?

The Marcinkiewicz 2S has a cup diameter of 17.27 mm / 0.6799 in compared to 16.51 mm / 0.6500 in on the Kelly 7C — a difference of 0.76 mm / 0.0299 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Kelly 7C and Marcinkiewicz 2S?

The Kelly 7C has a medium cup while the Marcinkiewicz 2S has a shallow cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.

Kelly 7C vs Marcinkiewicz 2S

Name: Marcinkiewicz 2S
Brand: Marcinkiewicz

The Marcinkiewicz 2S has a wider cup diameter, the Kelly 7C features a deeper cup, the Marcinkiewicz 2S has a larger throat opening.

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 7C

• Cornet

General

MaterialLexan polycarbonate

Best suited for

🎵All-round versatile — balanced cup for general playing

📋Beginner / intermediate

Mouthpiece B

Marcinkiewicz 2S

• Cornet

Material—

Material

The Kelly 7C is described as Lexan polycarbonate, and the Marcinkiewicz 2S 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.

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Kelly 7C vs Marcinkiewicz 2S

Material

Playing Characteristics

What Do These Model Names Mean?

What Changes If You Switch?

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