Which has a bigger cup — Bach 1½C or Conn Precision 4?

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 4 — 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 4?

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

Bach 1½C vs Conn Precision 4

Name: Conn Precision 4
Brand: Conn

The Bach 1½C has a wider cup diameter.

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

Surface plating or treatment (e.g. silver plate, gold trim). Affects feel, durability, and appearance.

Mouthpiece A

Bach 1½C

• Cornet

Finish—

Mouthpiece B

Conn Precision 4

• Cornet

General

Finish—

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.

Open in interactive tool + Add third mouthpiece Bach 1½C details Conn Precision 4 details Bach 1½C equivalents Conn Precision 4 equivalents

Bach 1½C vs Conn Precision 4

Playing Characteristics

What Do These Model Names Mean?

What Changes If You Switch?

Which is better?

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