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

The Conn Imp. 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 Imp. Precision 4?

The Bach 8½A has a very 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 8½A vs Conn Imp. Precision 4

Name: Conn Imp. Precision 4
Brand: Conn

The Conn Imp. 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

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

Mouthpiece A

Bach 8½A

• Cornet

Material—

Mouthpiece B

Conn Imp. Precision 4

• Cornet

General

MaterialSilver-plated brass

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

Material

The Bach 8½A is described as unspecified, and the Conn Imp. 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 8½A vs Conn Imp. Precision 4

Material

Playing Characteristics

What Do These Model Names Mean?

What Changes If You Switch?

Which is better?

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