Which has a bigger cup — Bach 8½A or Conn Connstellation 9BN?

The Bach 8½A has a cup diameter of 16.10 mm / 0.6339 in compared to 15.88 mm / 0.6252 in on the Conn Connstellation 9BN — a difference of 0.22 mm / 0.0087 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bach 8½A and Conn Connstellation 9BN?

Both mouthpieces share a very deep cup depth, so the sound character from depth alone will be very similar.

Bach 8½A vs Conn Connstellation 9BN

Name: Conn Connstellation 9BN
Brand: Conn

The Bach 8½A has a wider cup diameter.

Overall Comparison Cup Diameter Cup Depth Rim Width Throat Diameter Backbore Finish Material

The width of the rim surface that contacts the lips. Wider rims improve endurance; narrower rims improve flexibility.

Mouthpiece A

Bach 8½A

• Cornet

Rim width—

Mouthpiece B

Conn Connstellation 9BN

• Cornet

Lead

Rim width—

Best suited for

📋Trumpet players seeking precise matched dimensions

🎶Size 9 (15.88mm); smaller cup; more compact tone; Narrow rim; smaller inner radius; sharper bite. Fa

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.

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Bach 8½A vs Conn Connstellation 9BN

Playing Characteristics

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What Changes If You Switch?

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