Which has a bigger cup — Conn Precision 4 or Kelly 7C-UK?

The Kelly 7C-UK has a cup diameter of 16.51 mm / 0.6500 in compared to 16.41 mm / 0.6461 in on the Conn Precision 4 — a difference of 0.10 mm / 0.0039 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Conn Precision 4 and Kelly 7C-UK?

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

Conn Precision 4 vs Kelly 7C-UK

Name: Kelly 7C-UK
Brand: Kelly

The Kelly 7C-UK has a wider cup diameter.

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

The narrowest point at the bottom of the cup. Affects resistance, volume, and tone color.

Mouthpiece A

Conn Precision 4

• Cornet

General

Throat diameter—

Best suited for

🎵All-round versatile — balanced cup for general playing

📋Players with large lips; close to Bach 2C/Schilke 16C4

🎶Bright tone; same as Model 3 with wide rim

Mouthpiece B

Kelly 7C-UK

• Cornet

General

Throat diameter3.66 mm / 0.1441 in

Best suited for

🎵All-round versatile — balanced cup for general playing

📋Comfortable music-industry standard

Which is better?

Both mouthpieces are categorized as "General" — the physical dimensions above will determine which suits your embouchure and playing style better.

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Conn Precision 4 vs Kelly 7C-UK

Playing Characteristics

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What Changes If You Switch?

Which is better?

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