Bach 8 vs Bruno Tilz 213- S 1
The Bach 8 has a wider cup diameter, the Bach 8 has a larger throat opening.
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
Bach 8
• Baritone / Euphonium
Cup diameter24.75 mm / 0.9744 in
Best suited for
High-volume projection — open throat for power
vs
Mouthpiece B
Bruno Tilz 213- S 1
• Baritone / Euphonium
CatalogCup diameter22.00 mm / 0.8661 in
Best suited for
High-volume projection — open throat for power
Cup Diameter
The Bach 8 has a cup diameter of 24.75 mm / 0.9744 in compared to 22.00 mm / 0.8661 in on the Bruno Tilz 213- S 1 — a difference of 2.75 mm / 0.1083 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.