Which has a bigger cup — Kelly 5C or Monette Cornet E1-5M S12?

The Monette Cornet E1-5M S12 has a cup diameter of 17.00 mm / 0.6693 in compared to 16.76 mm / 0.6598 in on the Kelly 5C — a difference of 0.24 mm / 0.0094 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Kelly 5C and Monette Cornet E1-5M S12?

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

Kelly 5C vs Monette Cornet E1-5M S12

Name: Monette Cornet E1-5M S12
Brand: Monette

The Monette Cornet E1-5M S12 has a wider cup diameter, the Kelly 5C 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 5C

• Cornet

General

MaterialLexan polycarbonate

Best suited for

📣High-volume projection — open throat for power

📋Mid-range all-purpose

Mouthpiece B

Monette Cornet E1-5M S12

• Cornet

Material—

Best suited for

🎻Orchestral playing — large cup for full, dark tone

Material

The Kelly 5C is described as Lexan polycarbonate, and the Monette Cornet E1-5M S12 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 5C vs Monette Cornet E1-5M S12

Material

Playing Characteristics

What Do These Model Names Mean?

What Changes If You Switch?

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