Denis Wick 6BS vs Denis Wick 9BL
The Denis Wick 6BS has a wider cup diameter.
Mouthpiece A
Denis Wick 6BS
• Trombone
Cup diameter25.40 mm / 1.0000 in
Cup depthMedium
Rim width6.26 mm / 0.2465 in
Throat diameter6.66 mm / 0.2622 in
BackboreV-type
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
The Denis Wick 6BS has a cup diameter of 25.40 mm / 1.0000 in compared to 25.00 mm / 0.9843 in on the Denis Wick 9BL — a difference of 0.40 mm / 0.0157 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
Both mouthpieces share a medium cup depth, so the sound character from depth alone will be very similar.
Throat Diameter
Throat diameters are essentially identical at 6.66 mm / 0.2622 in, so resistance feel will be comparable.
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.