Which has a bigger cup — Bach 5C or Conn Precision 4?

The Conn Precision 4 has a cup diameter of 16.41 mm / 0.6461 in compared to 16.25 mm / 0.6398 in on the Bach 5C — 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 5C and Conn Precision 4?

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

Bach 5C 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 width of the rim surface that contacts the lips. Wider rims improve endurance; narrower rims improve flexibility.

Mouthpiece A

Bach 5C

• Trumpet

Rim width—

Best suited for

🎵All-round versatile — balanced cup for general playing

Mouthpiece B

Conn Precision 4

• Trumpet

General

Rim width—

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 5C vs Conn Precision 4

Playing Characteristics

What Do These Model Names Mean?

What Changes If You Switch?

Which is better?

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