Which has a bigger cup — Bach 8½A or Kelly 7C?

The Kelly 7C has a cup diameter of 16.51 mm / 0.6500 in compared to 16.10 mm / 0.6339 in on the Bach 8½A — a difference of 0.41 mm / 0.0161 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bach 8½A and Kelly 7C?

The Bach 8½A has a very deep cup while the Kelly 7C has a medium cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.

Bach 8½A vs Kelly 7C

Name: Kelly 7C
Brand: Kelly

The Kelly 7C has a wider cup diameter, the Bach 8½A features a deeper cup.

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

Base metal or construction (e.g. brass, stainless steel, plastic). Influences weight, response, and tone color.

Mouthpiece A

Bach 8½A

• Cornet

Material—

Mouthpiece B

Kelly 7C

• Cornet

General

MaterialLexan polycarbonate

Best suited for

🎵All-round versatile — balanced cup for general playing

📋Beginner / intermediate

Material

The Bach 8½A is described as unspecified, and the Kelly 7C as Lexan polycarbonate. Material affects mass, warmth, and how quickly the piece responds.

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 8½A details Kelly 7C details Bach 8½A equivalents Kelly 7C equivalents

Bach 8½A vs Kelly 7C

Material

Playing Characteristics

What Do These Model Names Mean?

What Changes If You Switch?

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