Bach 17D vs Bach 6½AL (small shank)
The Bach 6½AL (small shank) has a wider cup diameter, the Bach 6½AL (small shank) features a deeper cup, the Bach 6½AL (small shank) has a larger throat opening.
The width of the rim surface that contacts the lips. Wider rims improve endurance; narrower rims improve flexibility.
Mouthpiece A
Bach 17D
• Baritone / Euphonium
Rim width—
Best suited for
High-volume projection — open throat for power
vs
Mouthpiece B
Bach 6½AL (small shank)
• Baritone / Euphonium
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.