Bach 2G vs Yamaha SL-48DL
The Bach 2G has a wider cup diameter, the Bach 2G features a deeper cup, the Bach 2G has a larger throat opening.
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
Bach 2G
• Trombone
Cup diameter26.75 mm / 1.0531 in
Best suited for
Orchestral playing — large cup for full, dark tone
High-volume projection — open throat for power
vs
Mouthpiece B
Yamaha SL-48DL
• Trombone
Cup diameter25.25 mm / 0.9941 in
Best suited for
Orchestral playing — large cup for full, dark tone
High-volume projection — open throat for power
Cup Diameter
The Bach 2G has a cup diameter of 26.75 mm / 1.0531 in compared to 25.25 mm / 0.9941 in on the Yamaha SL-48DL — a difference of 1.50 mm / 0.0591 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.