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

The Kelly 3C has a cup diameter of 17.02 mm / 0.6701 in compared to 16.41 mm / 0.6461 in on the Conn Precision 3 — a difference of 0.61 mm / 0.0240 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 3C?

The Kelly 3C 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 3C

Name: Kelly 3C
Brand: Kelly

The Kelly 3C has a wider cup diameter, the Kelly 3C features a deeper cup.

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

The width of the rim surface that contacts the lips. Wider rims improve endurance; narrower rims improve flexibility.

Mouthpiece A

Conn Precision 3

• Cornet

General

Rim width—

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 3C

• Cornet

General

Rim width—

Best suited for

🎻Orchestral playing — large cup for full, dark tone

📣High-volume projection — open throat for power

📋All-purpose mid-range

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 3C

Playing Characteristics

What Do These Model Names Mean?

What Changes If You Switch?

Which is better?

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