Bach 9D vs Kelly SCREAMER
The Bach 9D has a wider cup diameter, the Bach 9D has a larger throat opening.
The narrowest point at the bottom of the cup. Affects resistance, volume, and tone color.
Mouthpiece A
Bach 9D
• Cornet
Throat diameter3.66 mm / 0.1441 in
Best suited for
Lead / commercial — shallow cup for brightness and range
vs
Mouthpiece B
Kelly SCREAMER
• Cornet
LeadThroat diameter3.56 mm / 0.1402 in
Best suited for
Lead / commercial — shallow cup for brightness and range
Screamer / high notes — tight throat with shallow cup
Lead / soprano cornet
Throat Diameter
The Bach 9D has a wider throat (3.66 mm / 0.1441 in vs 3.56 mm / 0.1402 in). A wider throat allows more air through, increasing volume and projection but reducing resistance.
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.