Bach 15D vs Denis Wick 5AL
The Denis Wick 5AL has a wider cup diameter, the Denis Wick 5AL features a deeper cup, the Denis Wick 5AL has a larger throat opening.
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
Bach 15D
• Trombone
Cup diameter24.40 mm / 0.9606 in
Best suited for
High-volume projection — open throat for power
vs
Mouthpiece B
Denis Wick 5AL
• Trombone
Cup diameter25.73 mm / 1.0130 in
Best suited for
High-volume projection — open throat for power
Cup Diameter
The Denis Wick 5AL has a cup diameter of 25.73 mm / 1.0130 in compared to 24.40 mm / 0.9606 in on the Bach 15D — a difference of 1.33 mm / 0.0524 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.