Bach 10½EW vs Bach 1B
The Bach 1B has a wider cup diameter, the Bach 1B features a deeper cup.
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
Bach 10½EW
• Cornet
Cup diameter15.90 mm / 0.6260 in
Best suited for
Lead / commercial — shallow cup for brightness and range
vs
Mouthpiece B
Bach 1B
• Cornet
Cup diameter17.00 mm / 0.6693 in
Best suited for
Orchestral playing — large cup for full, dark tone
Cup Diameter
The Bach 1B has a cup diameter of 17.00 mm / 0.6693 in compared to 15.90 mm / 0.6260 in on the Bach 10½EW — a difference of 1.10 mm / 0.0433 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.