Which has a bigger cup — Bach 8½A or Conn Precision 4?

The Conn Precision 4 has a cup diameter of 16.41 mm / 0.6461 in compared to 16.10 mm / 0.6339 in on the Bach 8½A — a difference of 0.31 mm / 0.0122 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bach 8½A and Conn Precision 4?

The Bach 8½A has a very deep cup while the Conn Precision 4 has a medium cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.

Bach 8½A vs Conn Precision 4

Name: Conn Precision 4
Brand: Conn

The Conn Precision 4 has a wider cup diameter, the Bach 8½A 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 8½A

• Cornet

Throat diameter3.66 mm / 0.1441 in

Mouthpiece B

Conn Precision 4

• Cornet

General

Throat diameter—

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 8½A vs Conn Precision 4

Playing Characteristics

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Which is better?

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