Which has a bigger cup — Conn Precision 3 or Kelly 5C?

The Kelly 5C has a cup diameter of 16.76 mm / 0.6598 in compared to 16.41 mm / 0.6461 in on the Conn Precision 3 — a difference of 0.35 mm / 0.0138 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Conn Precision 3 and Kelly 5C?

The Kelly 5C has a very deep cup while the Conn Precision 3 has a medium cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.

Conn Precision 3 vs Kelly 5C

Name: Kelly 5C
Brand: Kelly

The Kelly 5C has a wider cup diameter, the Kelly 5C features a deeper cup.

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 3

• Cornet

General

Throat diameter—

Best suited for

🎵All-round versatile — balanced cup for general playing

📋All-around use; most popular model

🎶Bright quality of tone in all registers; good all-around

Mouthpiece B

Kelly 5C

• Cornet

General

Throat diameter3.80 mm / 0.1496 in

Best suited for

📣High-volume projection — open throat for power

📋Mid-range all-purpose

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 3 vs Kelly 5C

Playing Characteristics

What Do These Model Names Mean?

What Changes If You Switch?

Which is better?

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