Which has a bigger cup — Bach 2½C or Conn Imp. Precision 3?

The Conn Imp. Precision 3 has a cup diameter of 16.41 mm / 0.6461 in compared to 16.40 mm / 0.6457 in on the Bach 2½C — a difference of 0.01 mm / 0.0004 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 Imp. Precision 3?

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

Bach 2½C vs Conn Imp. Precision 3

Name: Conn Imp. Precision 3
Brand: Conn

The Conn Imp. Precision 3 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 2½C

• Cornet

Rim width—

Best suited for

🎵All-round versatile — balanced cup for general playing

Mouthpiece B

Conn Imp. Precision 3

• Cornet

General

Rim width—

Best suited for

🎵All-round versatile — balanced cup for general playing

📋Most popular model; all-around

🎶Bright quality of tone in all registers

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 Imp. Precision 3

Playing Characteristics

What Do These Model Names Mean?

What Changes If You Switch?

Which is better?

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Compare Conn Imp. Precision 3 with others

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