Conn Precision 3 vs Giardinelli 17S
The Conn Precision 3 has a wider cup diameter, the Conn Precision 3 features a deeper cup.
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
Conn Precision 3
• Cornet
GeneralCup diameter16.41 mm / 0.6461 in
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
Giardinelli 17S
• Cornet
Cup diameter15.00 mm / 0.5906 in
Best suited for
Lead / commercial — shallow cup for brightness and range
Cup Diameter
The Conn Precision 3 has a cup diameter of 16.41 mm / 0.6461 in compared to 15.00 mm / 0.5906 in on the Giardinelli 17S — a difference of 1.41 mm / 0.0555 in. A wider cup generally produces a fuller, darker tone but requires more air support.
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.