Bach 8½A vs Conn Connstellation 5CN
The Conn Connstellation 5CN has a wider cup diameter, the Conn Connstellation 5CN features a deeper cup.
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 5CN
• Cornet
OrchestralCup diameter16.76 mm / 0.6598 in
Best suited for
Trumpet players seeking precise matched dimensions
Size 5 (16.76mm); larger cup; fuller lower register; Narrow rim; smaller inner radius; sharper bite.
Cup Diameter
The Conn Connstellation 5CN has a cup diameter of 16.76 mm / 0.6598 in compared to 16.10 mm / 0.6339 in on the Bach 8½A — a difference of 0.66 mm / 0.0260 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.