Bruno Tilz 231-A 2 vs Bruno Tilz 231-B 2
the Bruno Tilz 231-B 2 features a deeper cup.
Mouthpiece A
Bruno Tilz 231-A 2
• Tuba
CatalogCup diameter32.00 mm / 1.2598 in
Cup depthVery shallow
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 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
Cup Diameter
Both mouthpieces have virtually identical cup diameters at 32.00 mm / 1.2598 in.
Cup Depth
The Bruno Tilz 231-B 2 has a shallow cup while the Bruno Tilz 231-A 2 has a very shallow cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
Throat Diameter
Throat diameters are essentially identical at 7.20 mm / 0.2835 in, so resistance feel will be comparable.
Which is better?
Both mouthpieces are categorized as "Catalog" — the physical dimensions above will determine which suits your embouchure and playing style better.