Which has a bigger cup — Bach 1½C or Conn Precision 3?

The Bach 1½C has a cup diameter of 17.00 mm / 0.6693 in compared to 16.41 mm / 0.6461 in on the Conn Precision 3 — a difference of 0.59 mm / 0.0232 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bach 1½C and Conn Precision 3?

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

Bach 1½C vs Conn Precision 3

Name: Conn Precision 3
Brand: Conn

The Bach 1½C 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 1½C

• Cornet

Material—

Mouthpiece B

Conn Precision 3

• Cornet

General

MaterialSilver-plated brass

Best suited for

🎵All-round versatile — balanced cup for general playing

📋All-around use; most popular model

🎶Bright quality of tone in all registers; good all-around

Material

The Bach 1½C is described as unspecified, and the Conn Precision 3 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 1½C vs Conn Precision 3

Material

Playing Characteristics

What Do These Model Names Mean?

What Changes If You Switch?

Which is better?

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