Which has a bigger cup — Bach 8½A or Conn Connstellation 5BN?

The Conn Connstellation 5BN 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.

How does cup depth compare between Bach 8½A and Conn Connstellation 5BN?

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

Bach 8½A vs Conn Connstellation 5BN

Name: Conn Connstellation 5BN
Brand: Conn

The Conn Connstellation 5BN has a wider cup diameter.

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

Surface plating or treatment (e.g. silver plate, gold trim). Affects feel, durability, and appearance.

Mouthpiece A

Bach 8½A

• Cornet

Finish—

Mouthpiece B

Conn Connstellation 5BN

• Cornet

Orchestral

Finish—

Best suited for

📋Trumpet players seeking precise matched dimensions

🎶Size 5 (16.76mm); 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 5BN

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