Bach 1½C vs Giardinelli 17S
The Bach 1½C has a wider cup diameter, the Bach 1½C features a deeper cup.
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
Bach 1½C
• Cornet
Cup diameter17.00 mm / 0.6693 in
vs
Mouthpiece B
Giardinelli 17S
• Cornet
Cup diameter15.00 mm / 0.5906 in
Best suited for
Lead / commercial — shallow cup for brightness and range
Cup Diameter
The Bach 1½C has a cup diameter of 17.00 mm / 0.6693 in compared to 15.00 mm / 0.5906 in on the Giardinelli 17S — a difference of 2.00 mm / 0.0787 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.