Bach 5 vs Schilke 38D
The Bach 5 has a wider cup diameter.
Mouthpiece A
Bach 5
• Baritone / Euphonium
Cup diameter25.50 mm / 1.0039 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
Schilke 38D
• Baritone / Euphonium
Cup diameter19.73 mm / 0.7768 in
Cup depthMedium
Rim width—
Throat diameter—
Backbore—
Finish—
Material—
Cup Diameter
The Bach 5 has a cup diameter of 25.50 mm / 1.0039 in compared to 19.73 mm / 0.7768 in on the Schilke 38D — a difference of 5.77 mm / 0.2272 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.
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.