Which has a bigger cup — Bach 3C or Conn Precision 4?

The Conn Precision 4 has a cup diameter of 16.41 mm / 0.6461 in compared to 16.30 mm / 0.6417 in on the Bach 3C — a difference of 0.11 mm / 0.0043 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bach 3C and Conn Precision 4?

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

Bach 3C vs Conn Precision 4

Name: Conn Precision 4
Brand: Conn

The Conn 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 3C

• Trumpet

Backbore—

Best suited for

🎵All-round versatile — balanced cup for general playing

Mouthpiece B

Conn Precision 4

• Trumpet

General

Backbore—

Best suited for

🎵All-round versatile — balanced cup for general playing

📋Players with large lips; close to Bach 2C/Schilke 16C4

🎶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.

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Bach 3C vs Conn Precision 4

Playing Characteristics

What Do These Model Names Mean?

What Changes If You Switch?

Which is better?

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