Giardinelli 4M vs Kelly SKY-SS
The Giardinelli 4M has a wider cup diameter, the Giardinelli 4M features a deeper cup.
How deep the cup is, from shallow (brighter, easier high register) to deep (darker, fuller sound).
Mouthpiece A
Giardinelli 4M
• Trombone
Cup depthMedium
Best suited for
High-volume projection — open throat for power
vs
Mouthpiece B
Kelly SKY-SS
• Trombone
LeadCup depthShallow
Best suited for
Professional lead trombone
Cup Depth
The Giardinelli 4M has a medium cup while the Kelly SKY-SS has a shallow cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
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.