Bach 12C vs Giardinelli 2G
The Giardinelli 2G has a wider cup diameter, the Giardinelli 2G features a deeper cup, the Giardinelli 2G has a larger throat opening.
Cup Diameter
The Giardinelli 2G has a cup diameter of 26.50 mm / 1.0433 in compared to 24.50 mm / 0.9646 in on the Bach 12C — a difference of 2.00 mm / 0.0787 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Giardinelli 2G has a very deep cup while the Bach 12C has a shallow cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
Throat Diameter
The Giardinelli 2G has a wider throat (7.15 mm / 0.2815 in vs 5.85 mm / 0.2303 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.