Conn Precision 3 vs Conn Precision 3A
the Conn Precision 3 features a deeper cup.
The width of the rim surface that contacts the lips. Wider rims improve endurance; narrower rims improve flexibility.
Mouthpiece A
Conn Precision 3
• Trombone
GeneralRim width—
Best suited for
Musicians with large lips; all kinds of band work
Full round tone; ideal for large lips
vs
Mouthpiece B
Conn Precision 3A
• Trombone
GeneralRim width—
Best suited for
General trombone use
Good round tone in all registers; all-around
Which is better?
Both mouthpieces are categorized as "General" — the physical dimensions above will determine which suits your embouchure and playing style better.