Marcinkiewicz 8 vs Yamaha SL-48S-GP
The Marcinkiewicz 8 has a wider cup diameter.
Mouthpiece A
Marcinkiewicz 8
• Trombone
Cup diameter25.93 mm / 1.0209 in
Cup depthMedium
Rim width—
Throat diameter6.63 mm / 0.2610 in
Backbore—
Finish—
Material—
Best suited for
High-volume projection — open throat for power
vs
Mouthpiece B
Yamaha SL-48S-GP
• Trombone
Cup diameter25.25 mm / 0.9941 in
Cup depthMedium
Rim width—
Throat diameter6.62 mm / 0.2606 in
BackboreSemi-wide
Finish—
Material—
Best suited for
High-volume projection — open throat for power
Cup Diameter
The Marcinkiewicz 8 has a cup diameter of 25.93 mm / 1.0209 in compared to 25.25 mm / 0.9941 in on the Yamaha SL-48S-GP — a difference of 0.68 mm / 0.0268 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 6.63 mm / 0.2610 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.