Bach 12 vs Bruno Tilz 213- S 2
The Bach 12 has a wider cup diameter, the Bach 12 features a deeper cup, the Bach 12 has a larger throat opening.
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
Bach 12
• Baritone / Euphonium
Cup diameter24.50 mm / 0.9646 in
Best suited for
Orchestral playing — large cup for full, dark tone
High-volume projection — open throat for power
vs
Mouthpiece B
Bruno Tilz 213- S 2
• Baritone / Euphonium
CatalogCup diameter23.00 mm / 0.9055 in
Best suited for
High-volume projection — open throat for power
Cup Diameter
The Bach 12 has a cup diameter of 24.50 mm / 0.9646 in compared to 23.00 mm / 0.9055 in on the Bruno Tilz 213- S 2 — a difference of 1.50 mm / 0.0591 in. A wider cup generally produces a fuller, darker tone but requires more air support.
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.