Bach 17D vs Giardinelli 6D
The Giardinelli 6D has a wider cup diameter, the Giardinelli 6D features a deeper cup, the Giardinelli 6D has a larger throat opening.
Cup Diameter
The Giardinelli 6D has a cup diameter of 24.50 mm / 0.9646 in compared to 24.20 mm / 0.9528 in on the Bach 17D — a difference of 0.30 mm / 0.0118 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Giardinelli 6D has a deep cup while the Bach 17D has a shallow cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
Throat Diameter
The Giardinelli 6D has a wider throat (6.00 mm / 0.2362 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.