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

Base metal or construction (e.g. brass, stainless steel, plastic). Influences weight, response, and tone color.

Mouthpiece A

Bach 5C

• Trumpet

Material—

Best suited for

🎵All-round versatile — balanced cup for general playing

Mouthpiece B

Conn Precision 4

• Trumpet

General

MaterialSilver-plated brass

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

Material

The Bach 5C is described as unspecified, and the Conn Precision 4 as Silver-plated brass. Material affects mass, warmth, and how quickly the piece responds.

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

Material

Playing Characteristics

What Do These Model Names Mean?

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