Bach 6 vs Giardinelli 4D
The Bach 6 has a wider cup diameter, the Giardinelli 4D features a deeper cup, the Giardinelli 4D has a larger throat opening.
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
Bach 6
• Baritone / Euphonium
Cup diameter25.50 mm / 1.0039 in
Best suited for
High-volume projection — open throat for power
vs
Mouthpiece B
Giardinelli 4D
• Baritone / Euphonium
Cup diameter25.40 mm / 1.0000 in
Best suited for
Orchestral playing — large cup for full, dark tone
High-volume projection — open throat for power
Cup Diameter
The Bach 6 has a cup diameter of 25.50 mm / 1.0039 in compared to 25.40 mm / 1.0000 in on the Giardinelli 4D — a difference of 0.10 mm / 0.0039 in. A wider cup generally produces a fuller, darker tone but requires more air support.
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.