Which has a bigger cup — Bach 2½C or Kelly 5C?

The Kelly 5C has a cup diameter of 16.76 mm / 0.6598 in compared to 16.40 mm / 0.6457 in on the Bach 2½C — a difference of 0.36 mm / 0.0142 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bach 2½C and Kelly 5C?

The Kelly 5C has a very deep cup while the Bach 2½C has a medium cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.

Bach 2½C vs Kelly 5C

Name: Kelly 5C
Brand: Kelly

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

Bach 2½C

• Cornet

Backbore—

Best suited for

🎵All-round versatile — balanced cup for general playing

Mouthpiece B

Kelly 5C

• Cornet

General

BackboreM

Best suited for

📣High-volume projection — open throat for power

📋Mid-range all-purpose

Which is better?

Neither mouthpiece clearly dominates the other — the right choice depends on your embouchure, playing style, and the sound you're after. Try both if possible.

Open in interactive tool + Add third mouthpiece Bach 2½C details Kelly 5C details Bach 2½C equivalents Kelly 5C equivalents

Bach 2½C vs Kelly 5C

Playing Characteristics

What Do These Model Names Mean?

What Changes If You Switch?

Which is better?

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