Which has a bigger cup — Bach 2½C or Conn Connstellation 5BN?

The Conn Connstellation 5BN has a cup diameter of 16.76 mm / 0.6598 in compared to 16.40 mm / 0.6457 in on the Bach 2½C — a difference of 0.36 mm / 0.0142 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bach 2½C and Conn Connstellation 5BN?

The Conn Connstellation 5BN has a very deep cup while the Bach 2½C has a medium cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.

Bach 2½C vs Conn Connstellation 5BN

Name: Conn Connstellation 5BN
Brand: Conn

The Conn Connstellation 5BN has a wider cup diameter, the Conn Connstellation 5BN features a deeper cup.

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

The narrowest point at the bottom of the cup. Affects resistance, volume, and tone color.

Mouthpiece A

Bach 2½C

• Cornet

Throat diameter3.66 mm / 0.1441 in

Best suited for

🎵All-round versatile — balanced cup for general playing

Mouthpiece B

Conn Connstellation 5BN

• Cornet

Orchestral

Throat diameter—

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.

Open in interactive tool + Add third mouthpiece Bach 2½C details Conn Connstellation 5BN details Bach 2½C equivalents Conn Connstellation 5BN equivalents

Bach 2½C vs Conn Connstellation 5BN

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