Which has a bigger cup — Bach 1B or Conn Imp. Precision 4?

The Bach 1B has a cup diameter of 17.00 mm / 0.6693 in compared to 16.41 mm / 0.6461 in on the Conn Imp. 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 1B and Conn Imp. Precision 4?

The Bach 1B has a deep cup while the Conn Imp. Precision 4 has a medium cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.

Bach 1B vs Conn Imp. Precision 4

Name: Conn Imp. Precision 4
Brand: Conn

The Bach 1B has a wider cup diameter, the Bach 1B features a deeper cup.

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

The narrowest point at the bottom of the cup. Affects resistance, volume, and tone color.

Mouthpiece A

Bach 1B

• Cornet

Throat diameter3.66 mm / 0.1441 in

Best suited for

🎻Orchestral playing — large cup for full, dark tone

Mouthpiece B

Conn Imp. Precision 4

• Cornet

General

Throat diameter—

Best suited for

🎵All-round versatile — balanced cup for general playing

📋Players with large full lips; most common surviving example

🎶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 1B details Conn Imp. Precision 4 details Bach 1B equivalents Conn Imp. Precision 4 equivalents

Bach 1B vs Conn Imp. Precision 4

Playing Characteristics

What Do These Model Names Mean?

What Changes If You Switch?

Which is better?

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Compare Conn Imp. Precision 4 with others

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