Conn Precision 3 vs Yamaha CR-11C4S
The Yamaha CR-11C4S has a wider cup diameter.
Mouthpiece A
Conn Precision 3
• Cornet
GeneralCup diameter16.41 mm / 0.6461 in
Cup depthMedium
Rim width—
Throat diameter—
Backbore—
Finish—
MaterialSilver-plated brass
Best suited for
All-round versatile — balanced cup for general playing
All-around use; most popular model
Bright quality of tone in all registers; good all-around
vs
Mouthpiece B
Yamaha CR-11C4S
• Cornet
Cup diameter16.46 mm / 0.6480 in
Cup depthMedium
Rim width—
Throat diameter3.65 mm / 0.1437 in
BackboreSemi-narrow
Finish—
Material—
Best suited for
All-round versatile — balanced cup for general playing
Cup Diameter
The Yamaha CR-11C4S has a cup diameter of 16.46 mm / 0.6480 in compared to 16.41 mm / 0.6461 in on the Conn Precision 3 — a difference of 0.05 mm / 0.0020 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.
Material
The Conn Precision 3 is described as Silver-plated brass, and the Yamaha CR-11C4S as unspecified. Material affects mass, warmth, and how quickly the piece responds.
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.