Bach 4 vs Curry 4C
The Bach 4 has a wider cup diameter, the Curry 4C has a larger throat opening.
Mouthpiece A
Bach 4
• Trombone
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
Curry 4C
• Trombone
Cup diameter25.73 mm / 1.0130 in
Cup depthMedium
Rim width—
Throat diameter5.92 mm / 0.2330 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 25.73 mm / 1.0130 in on the Curry 4C — a difference of 0.27 mm / 0.0106 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 Curry 4C has a wider throat (5.92 mm / 0.2330 in vs 5.85 mm / 0.2303 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.