Which has a bigger cup — Bach 18 or Kelly 24AW?

The Bach 18 has a cup diameter of 32.10 mm / 1.2638 in compared to 31.24 mm / 1.2299 in on the Kelly 24AW — a difference of 0.86 mm / 0.0339 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bach 18 and Kelly 24AW?

The Kelly 24AW has a very deep cup while the Bach 18 has a medium cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.

Bach 18 vs Kelly 24AW

Name: Kelly 24AW
Brand: Kelly

The Bach 18 has a wider cup diameter, the Kelly 24AW features a deeper cup.

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

The width of the rim surface that contacts the lips. Wider rims improve endurance; narrower rims improve flexibility.

Mouthpiece A

Bach 18

• Tuba

Rim width—

Best suited for

📣High-volume projection — open throat for power

Mouthpiece B

Kelly 24AW

• Tuba

General

Rim width—

Best suited for

🎻Orchestral playing — large cup for full, dark tone

📋Tuba / sousaphone

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 18 details Kelly 24AW details Bach 18 equivalents Kelly 24AW equivalents

Bach 18 vs Kelly 24AW

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