Conn Imp. Precision 3 vs Conn Imp. Precision 4
the Conn Imp. Precision 4 features a deeper cup.
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
Conn Imp. Precision 3
• Trombone
GeneralCup diameter—
Best suited for
Large lips; all band work
Full round tone
vs
Mouthpiece B
Conn Imp. Precision 4
• Trombone
OrchestralCup diameter—
Best suited for
Bass trombone / large bore tenor
Full rich deep tone
Which is better?
The Conn Imp. Precision 3 is designed for general playing, while the Conn Imp. Precision 4 targets orchestral use. Your best choice depends on your musical context.