Bach 6½AL (large shank) vs Marcinkiewicz CH 1.5G
The Marcinkiewicz CH 1.5G has a wider cup diameter, the Bach 6½AL (large shank) features a deeper cup, the Marcinkiewicz CH 1.5G has a larger throat opening.
Cup Diameter
The Marcinkiewicz CH 1.5G has a cup diameter of 27.84 mm / 1.0961 in compared to 25.40 mm / 1.0000 in on the Bach 6½AL (large shank) — a difference of 2.44 mm / 0.0961 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Bach 6½AL (large shank) has a deep cup while the Marcinkiewicz CH 1.5G has a very shallow cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
Throat Diameter
The Marcinkiewicz CH 1.5G has a wider throat (7.14 mm / 0.2811 in vs 6.63 mm / 0.2610 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.