Bruno Tilz 231-B 2 vs Bruno Tilz 310-M 9
the Bruno Tilz 310-M 9 has a larger throat opening.
Mouthpiece A
Bruno Tilz 231-B 2
• Tuba
CatalogCup diameter32.00 mm / 1.2598 in
Cup depthShallow
Rim width—
Throat diameter7.20 mm / 0.2835 in
Backbore—
Finish—
Material—
Best suited for
High-volume projection — open throat for power
vs
Mouthpiece B
Bruno Tilz 310-M 9
• Tuba
CatalogCup diameter32.00 mm / 1.2598 in
Cup depthShallow
Rim width—
Throat diameter7.80 mm / 0.3071 in
Backbore—
Finish—
Material—
Best suited for
High-volume projection — open throat for power
Cup Diameter
Both mouthpieces have virtually identical cup diameters at 32.00 mm / 1.2598 in.
Cup Depth
Both mouthpieces share a shallow cup depth, so the sound character from depth alone will be very similar.
Throat Diameter
The Bruno Tilz 310-M 9 has a wider throat (7.80 mm / 0.3071 in vs 7.20 mm / 0.2835 in). A wider throat allows more air through, increasing volume and projection but reducing resistance.
Which is better?
Both mouthpieces are categorized as "Catalog" — the physical dimensions above will determine which suits your embouchure and playing style better.