Denis Wick 10CS vs Denis Wick 9BL
the Denis Wick 9BL has a larger throat opening.
Mouthpiece A
Denis Wick 10CS
• Trombone
Cup diameter25.00 mm / 0.9843 in
Cup depthMedium
Rim width6.46 mm / 0.2543 in
Throat diameter6.24 mm / 0.2457 in
Backboremedium
Finish—
Material—
Best suited for
High-volume projection — open throat for power
vs
Mouthpiece B
Denis Wick 9BL
• Trombone
Cup diameter25.00 mm / 0.9843 in
Cup depthMedium
Rim width6.46 mm / 0.2543 in
Throat diameter6.66 mm / 0.2622 in
BackboreV-type
Finish—
Material—
Best suited for
High-volume projection — open throat for power
Cup Diameter
Both mouthpieces have virtually identical cup diameters at 25.00 mm / 0.9843 in.
Cup Depth
Both mouthpieces share a medium cup depth, so the sound character from depth alone will be very similar.
Throat Diameter
The Denis Wick 9BL has a wider throat (6.66 mm / 0.2622 in vs 6.24 mm / 0.2457 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.