Bach 18 vs Conn Imp. Precision 1
the Conn Imp. Precision 1 features a deeper cup.
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
vs
Mouthpiece B
Conn Imp. Precision 1
• Tuba
OrchestralBackbore—
Best suited for
BBb bass / sousaphone orchestral
Exceptionally full deep 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.