Which has a bigger cup — Bob Reeves 43N/B/s or Kelly 7C?

The Bob Reeves 43N/B/s has a cup diameter of 17.07 mm / 0.6720 in compared to 16.51 mm / 0.6500 in on the Kelly 7C — a difference of 0.56 mm / 0.0220 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bob Reeves 43N/B/s and Kelly 7C?

The Bob Reeves 43N/B/s 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.

Bob Reeves 43N/B/s vs Kelly 7C

Name: Kelly 7C
Brand: Kelly

The Bob Reeves 43N/B/s has a wider cup diameter, the Bob Reeves 43N/B/s 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

Bob Reeves 43N/B/s

• Cornet

Material—

Best suited for

🎻Orchestral playing — large cup for full, dark tone

Mouthpiece B

Kelly 7C

• Cornet

General

MaterialLexan polycarbonate

Best suited for

🎵All-round versatile — balanced cup for general playing

📋Beginner / intermediate

Material

The Bob Reeves 43N/B/s 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.

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Bob Reeves 43N/B/s vs Kelly 7C

Material

Playing Characteristics

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