Which has a bigger cup — Bruno Tilz 231-C 4 or Kelly X-SMALL?

The Bruno Tilz 231-C 4 has a cup diameter of 33.00 mm / 1.2992 in compared to 30.73 mm / 1.2098 in on the Kelly X-SMALL — a difference of 2.27 mm / 0.0894 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bruno Tilz 231-C 4 and Kelly X-SMALL?

The Bruno Tilz 231-C 4 has a deep cup while the Kelly X-SMALL has a shallow cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.

Bruno Tilz 231-C 4 vs Kelly X-SMALL

Name: Kelly X-SMALL
Brand: Kelly

The Bruno Tilz 231-C 4 has a wider cup diameter, the Bruno Tilz 231-C 4 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

Bruno Tilz 231-C 4

• Tuba

Catalog

Rim width—

Best suited for

🎻Orchestral playing — large cup for full, dark tone

📣High-volume projection — open throat for power

Mouthpiece B

Kelly X-SMALL

• Tuba

Student

Rim width—

Best suited for

📋Student / Eb tuba / euphonium doubler

Which is better?

The Bruno Tilz 231-C 4 is designed for catalog playing, while the Kelly X-SMALL targets student use. Your best choice depends on your musical context.

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Bruno Tilz 231-C 4 vs Kelly X-SMALL

Playing Characteristics

What Do These Model Names Mean?

What Changes If You Switch?

Which is better?

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