How does cup depth compare between Bach 12E and Conn Precision 4?

The Conn Precision 4 has a — cup while the Bach 12E has a shallow cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.

Bach 12E vs Conn Precision 4

Name: Conn Precision 4
Brand: Conn

the Conn Precision 4 features a deeper cup.

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

The internal diameter of the cup, measured at the widest point inside the rim.

Mouthpiece A

Bach 12E

• Trombone

Cup diameter24.50 mm / 0.9646 in

Best suited for

📣High-volume projection — open throat for power

Mouthpiece B

Conn Precision 4

• Trombone

Orchestral

Cup diameter—

Best suited for

📋Bass trombone

🎶Full rich deep tone quality

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.