Which has a bigger cup — Conn Precision 4 or Yamaha CR-14ES-GP?

The Yamaha CR-14ES-GP has a cup diameter of 16.86 mm / 0.6638 in compared to 16.41 mm / 0.6461 in on the Conn Precision 4 — a difference of 0.45 mm / 0.0177 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Conn Precision 4 and Yamaha CR-14ES-GP?

The Yamaha CR-14ES-GP 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.

Conn Precision 4 vs Yamaha CR-14ES-GP

Name: Yamaha CR-14ES-GP
Brand: Yamaha

The Yamaha CR-14ES-GP has a wider cup diameter, the Yamaha CR-14ES-GP features a deeper cup.

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

The width of the rim surface that contacts the lips. Wider rims improve endurance; narrower rims improve flexibility.

Mouthpiece A

Conn Precision 4

• Cornet

General

Rim width—

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

Mouthpiece B

Yamaha CR-14ES-GP

• Cornet

Rim width—

Best suited for

🎻Orchestral playing — large cup for full, dark tone

📣High-volume projection — open throat for power

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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Conn Precision 4 vs Yamaha CR-14ES-GP

Playing Characteristics

What Do These Model Names Mean?

What Changes If You Switch?

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