Bach 12E vs Conn Connstellation 5BN
the Conn Connstellation 5BN features a deeper cup.
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
Bach 12E
• Trombone
Cup diameter24.50 mm / 0.9646 in
Best suited for
High-volume projection — open throat for power
vs
Mouthpiece B
Conn Connstellation 5BN
• Trombone
GeneralCup diameter—
Best suited for
Trombone players
Trombone size 5; smaller cup; more compact tone; Narrow rim; smaller inner radius; sharper bite. Fac
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.