Bach 4G vs Yamaha SL-48L
The Bach 4G has a wider cup diameter, the Bach 4G features a deeper cup, the Bach 4G has a larger throat opening.
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
Bach 4G
• Trombone
Cup diameter26.00 mm / 1.0236 in
Best suited for
Orchestral playing — large cup for full, dark tone
High-volume projection — open throat for power
vs
Mouthpiece B
Yamaha SL-48L
• Trombone
Cup diameter25.25 mm / 0.9941 in
Best suited for
High-volume projection — open throat for power
Cup Diameter
The Bach 4G has a cup diameter of 26.00 mm / 1.0236 in compared to 25.25 mm / 0.9941 in on the Yamaha SL-48L — a difference of 0.75 mm / 0.0295 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.