Bach 4C vs Schilke 38D
The Bach 4C has a wider cup diameter, the Schilke 38D features a deeper cup.
Mouthpiece A
Bach 4C
• Baritone / Euphonium
Cup diameter25.75 mm / 1.0138 in
Cup depthShallow
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
Schilke 38D
• Baritone / Euphonium
Cup diameter19.73 mm / 0.7768 in
Cup depthMedium
Rim width—
Throat diameter—
Backbore—
Finish—
Material—
Cup Diameter
The Bach 4C has a cup diameter of 25.75 mm / 1.0138 in compared to 19.73 mm / 0.7768 in on the Schilke 38D — a difference of 6.02 mm / 0.2370 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Schilke 38D has a medium cup while the Bach 4C has a shallow cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
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.