Which has a bigger cup — Bach 8½A or Kelly 6V-UK?

The Bach 8½A has a cup diameter of 16.10 mm / 0.6339 in compared to 16.00 mm / 0.6299 in on the Kelly 6V-UK — a difference of 0.10 mm / 0.0039 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 6V-UK?

The Kelly 6V-UK has a — cup while the Bach 8½A has a very deep cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.

Bach 8½A vs Kelly 6V-UK

Name: Kelly 6V-UK
Brand: Kelly

The Bach 8½A has a wider cup diameter, the Kelly 6V-UK features a deeper cup, the Kelly 6V-UK has a larger throat opening.

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 6V-UK

• Cornet

Dark/Deep

MaterialLexan polycarbonate

Best suited for

📣High-volume projection — open throat for power

📋Deep V-cup cornet sound

Material

The Bach 8½A is described as unspecified, and the Kelly 6V-UK 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 6V-UK details Bach 8½A equivalents Kelly 6V-UK equivalents

Bach 8½A vs Kelly 6V-UK

Material

Playing Characteristics

What Do These Model Names Mean?

What Changes If You Switch?

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