Which has a bigger cup — Bach 2½C or Conn Imp. Precision 4?

The Conn Imp. Precision 4 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 4?

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

Bach 2½C vs Conn Imp. Precision 4

Name: Conn Imp. Precision 4
Brand: Conn

The Conn Imp. Precision 4 has a wider cup diameter.

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

The taper behind the throat leading to the shank. Affects projection and tone character.

Mouthpiece A

Bach 2½C

• Cornet

Backbore—

Best suited for

🎵All-round versatile — balanced cup for general playing

Mouthpiece B

Conn Imp. Precision 4

• Cornet

General

Backbore—

Best suited for

🎵All-round versatile — balanced cup for general playing

📋Players with large full lips; most common surviving example

🎶Bright tone; same as Model 3 with wide rim

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 Imp. Precision 4 details Bach 2½C equivalents Conn Imp. Precision 4 equivalents

Bach 2½C vs Conn Imp. Precision 4

Playing Characteristics

What Do These Model Names Mean?

What Changes If You Switch?

Which is better?

Compare Bach 2½C with others

Compare Conn Imp. Precision 4 with others

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