Which has a bigger cup — Conn Imp. Precision 4 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 Imp. Precision 4 — 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 Imp. Precision 4 and Kelly 5C?

The Kelly 5C has a very deep cup while the Conn Imp. Precision 4 has a medium cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.

Conn Imp. Precision 4 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 taper behind the throat leading to the shank. Affects projection and tone character.

Mouthpiece A

Conn Imp. Precision 4

• Cornet

General

Backbore—

Best suited for

🎵All-round versatile — balanced cup for general playing

📋Players with large full lips; most common surviving example

🎶Bright tone; same as Model 3 with wide rim

Mouthpiece B

Kelly 5C

• Cornet

General

BackboreM

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 Imp. Precision 4 vs Kelly 5C

Playing Characteristics

What Do These Model Names Mean?

What Changes If You Switch?

Which is better?

Compare Conn Imp. Precision 4 with others

Compare Kelly 5C with others

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