Which has a bigger cup — Kelly 4B-UK or Kelly 6V?

The Kelly 4B-UK has a cup diameter of 16.51 mm / 0.6500 in compared to 16.00 mm / 0.6299 in on the Kelly 6V — a difference of 0.51 mm / 0.0201 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Kelly 4B-UK and Kelly 6V?

The Kelly 6V has a — cup while the Kelly 4B-UK has a — cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.

Kelly 4B-UK vs Kelly 6V

Name: Kelly 6V
Brand: Kelly

The Kelly 4B-UK has a wider cup diameter, the Kelly 6V features a deeper cup, the Kelly 4B-UK has a larger throat opening.

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

Kelly 4B-UK

• Cornet

Orchestral

BackboreXL

Best suited for

📣High-volume projection — open throat for power

📋Professional cornet; British brass band

Mouthpiece B

Kelly 6V

• Cornet

Dark/Deep

BackboreL

Best suited for

📣High-volume projection — open throat for power

📋Deep V-cup to fill out cornet sound

Which is better?

The Kelly 4B-UK is designed for orchestral playing, while the Kelly 6V targets dark/deep use. Your best choice depends on your musical context.

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Kelly 4B-UK vs Kelly 6V

Playing Characteristics

What Do These Model Names Mean?

What Changes If You Switch?

Which is better?

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