Bach 18 vs Bach 18D
the Bach 18 features a deeper cup.
The width of the rim surface that contacts the lips. Wider rims improve endurance; narrower rims improve flexibility.
Mouthpiece A
Bach 18
• Trombone
Rim width—
Best suited for
High-volume projection — open throat for power
vs
Mouthpiece B
Bach 18D
• Trombone
Rim width—
Best suited for
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.