Bach 3C vs Monette E2.5 FL
The Monette E2.5 FL has a wider cup diameter, the Monette E2.5 FL features a deeper cup.
Cup Diameter
The Monette E2.5 FL has a cup diameter of 16.40 mm / 0.6457 in compared to 16.30 mm / 0.6417 in on the Bach 3C — a difference of 0.10 mm / 0.0039 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Monette E2.5 FL has a deep cup while the Bach 3C has a medium cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
Throat Diameter
Throat diameters are essentially identical at 3.66 mm / 0.1441 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.