Bach 11C vs Bruno Tilz 304- B 1
The Bach 11C has a wider cup diameter, the Bach 11C has a larger throat opening.
Mouthpiece A
Bach 11C
• Baritone / Euphonium
Cup diameter24.70 mm
Cup depthShallow
Rim width—
Throat diameter5.85 mm
Backbore—
Finish—
Material—
Best suited for
High-volume projection — open throat for power
vs
Mouthpiece B
Bruno Tilz 304- B 1
• Baritone / Euphonium
CatalogCup diameter22.00 mm
Cup depthShallow
Rim width—
Throat diameter4.40 mm
Backbore—
Finish—
Material—
Best suited for
High-volume projection — open throat for power
Cup Diameter
The Bach 11C has a cup diameter of 24.70 mm compared to 22.00 mm on the Bruno Tilz 304- B 1 — a difference of +2.70 mm. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
Both mouthpieces share a shallow cup depth, so the sound character from depth alone will be very similar.
Throat Diameter
The Bach 11C has a wider throat (5.85 mm vs 4.40 mm). A wider throat allows more air through, increasing volume and projection but reducing resistance.
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.