Bach 15EW vs Bach 22D
The Bach 15EW has a wider cup diameter.
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
Bach 15EW
• Trombone
Cup diameter24.30 mm / 0.9567 in
Best suited for
High-volume projection — open throat for power
vs
Mouthpiece B
Bach 22D
• Trombone
Cup diameter23.92 mm / 0.9417 in
Best suited for
High-volume projection — open throat for power
Cup Diameter
The Bach 15EW has a cup diameter of 24.30 mm / 0.9567 in compared to 23.92 mm / 0.9417 in on the Bach 22D — a difference of 0.38 mm / 0.0150 in. A wider cup generally produces a fuller, darker tone but requires more air support.
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.