Bach 4 vs Bruno Tilz 213- S 2
The Bach 4 has a wider cup diameter, the Bach 4 has a larger throat opening.
Mouthpiece A
Bach 4
• Baritone / Euphonium
Cup diameter26.00 mm / 1.0236 in
Cup depthMedium
Rim width—
Throat diameter5.85 mm / 0.2303 in
Backbore—
Finish—
Material—
Best suited for
High-volume projection — open throat for power
vs
Mouthpiece B
Bruno Tilz 213- S 2
• Baritone / Euphonium
CatalogCup diameter23.00 mm / 0.9055 in
Cup depthMedium
Rim width—
Throat diameter4.60 mm / 0.1811 in
Backbore—
Finish—
Material—
Best suited for
High-volume projection — open throat for power
Cup Diameter
The Bach 4 has a cup diameter of 26.00 mm / 1.0236 in compared to 23.00 mm / 0.9055 in on the Bruno Tilz 213- S 2 — a difference of 3.00 mm / 0.1181 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
Both mouthpieces share a medium cup depth, so the sound character from depth alone will be very similar.
Throat Diameter
The Bach 4 has a wider throat (5.85 mm / 0.2303 in vs 4.60 mm / 0.1811 in). 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.