Bach 8½A vs Conn Connstellation 7BN
The Conn Connstellation 7BN has a wider cup diameter.
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
Bach 8½A
• Cornet
Cup diameter16.10 mm / 0.6339 in
vs
Mouthpiece B
Conn Connstellation 7BN
• Cornet
GeneralCup diameter16.42 mm / 0.6465 in
Best suited for
Trumpet players seeking precise matched dimensions
Size 7 (16.42mm); smaller cup; more compact tone; Narrow rim; smaller inner radius; sharper bite. Fa
Cup Diameter
The Conn Connstellation 7BN has a cup diameter of 16.42 mm / 0.6465 in compared to 16.10 mm / 0.6339 in on the Bach 8½A — a difference of 0.32 mm / 0.0126 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.