Which has a bigger cup — Bach 2½C or Conn Precision 1?

The Conn Precision 1 has a cup diameter of 16.56 mm / 0.6520 in compared to 16.40 mm / 0.6457 in on the Bach 2½C — a difference of 0.16 mm / 0.0063 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 Precision 1?

The Conn Precision 1 has a — 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 Precision 1

Name: Conn Precision 1
Brand: Conn

The Conn Precision 1 has a wider cup diameter, the Conn Precision 1 features a deeper cup.

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 2½C

• Cornet

Rim width—

Best suited for

🎵All-round versatile — balanced cup for general playing

Mouthpiece B

Conn Precision 1

• Cornet

General

Rim width—

Best suited for

📋All-around players; comfortable wide rim

🎶Full round tone; suited to low notes

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 2½C vs Conn Precision 1

Playing Characteristics

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