Kelly 5G-LS vs Marcinkiewicz 8H-S
The Marcinkiewicz 8H-S has a wider cup diameter, the Kelly 5G-LS features a deeper cup.
Cup Diameter
The Marcinkiewicz 8H-S has a cup diameter of 26.06 mm / 1.0260 in compared to 25.40 mm / 1.0000 in on the Kelly 5G-LS — a difference of 0.66 mm / 0.0260 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Kelly 5G-LS has a — cup while the Marcinkiewicz 8H-S has a shallow cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
Material
The Kelly 5G-LS is described as Lexan polycarbonate, and the Marcinkiewicz 8H-S as unspecified. Material affects mass, warmth, and how quickly the piece responds.
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.
Compare Kelly 5G-LS with others
Compare Marcinkiewicz 8H-S with others
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