Bruno Tilz 231-C 4 vs Bruno Tilz 231-T 2
The Bruno Tilz 231-C 4 has a wider cup diameter, the Bruno Tilz 231-C 4 has a larger throat opening.
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
Bruno Tilz 231-C 4
• Tuba
CatalogCup diameter33.00 mm / 1.2992 in
Best suited for
Orchestral playing — large cup for full, dark tone
High-volume projection — open throat for power
vs
Mouthpiece B
Bruno Tilz 231-T 2
• Tuba
CatalogCup diameter32.00 mm / 1.2598 in
Best suited for
Orchestral playing — large cup for full, dark tone
High-volume projection — open throat for power
Cup Diameter
The Bruno Tilz 231-C 4 has a cup diameter of 33.00 mm / 1.2992 in compared to 32.00 mm / 1.2598 in on the Bruno Tilz 231-T 2 — a difference of 1.00 mm / 0.0394 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Which is better?
Both mouthpieces are categorized as "Catalog" — the physical dimensions above will determine which suits your embouchure and playing style better.