Schilke 47 vs Schilke 47C4
The Schilke 47C4 has a wider cup diameter.
Mouthpiece A
Schilke 47
• Trombone
Cup diameter24.99 mm / 0.9839 in
Cup depthMedium
Rim width—
Throat diameter5.95 mm / 0.2343 in
Backbore15/64 .2344"
Finish—
Material—
Best suited for
High-volume projection — open throat for power
vs
Mouthpiece B
Schilke 47C4
• Trombone
Cup diameter25.10 mm / 0.9882 in
Cup depthMedium
Rim width—
Throat diameter5.95 mm / 0.2343 in
Backbore15/64 .2344"
Finish—
Material—
Best suited for
High-volume projection — open throat for power
Cup Diameter
The Schilke 47C4 has a cup diameter of 25.10 mm / 0.9882 in compared to 24.99 mm / 0.9839 in on the Schilke 47 — a difference of 0.11 mm / 0.0043 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
Throat diameters are essentially identical at 5.95 mm / 0.2343 in, so resistance feel will be comparable.
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.