How does cup depth compare between Bach 18 and Conn Precision 4?

The Conn Precision 4 has a deep cup while the Bach 18 has a medium cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.

Bach 18 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 taper behind the throat leading to the shank. Affects projection and tone character.

Mouthpiece A

Bach 18

• Tuba

Backbore—

Best suited for

📣High-volume projection — open throat for power

Mouthpiece B

Conn Precision 4

• Tuba

General

Backbore—

Best suited for

📋Small Eb bass

🎶Full rich tone

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.