Bach 3G vs Yamaha SL-53L
The Bach 3G has a wider cup diameter, the Bach 3G features a deeper cup, the Yamaha SL-53L has a larger throat opening.
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
Bach 3G
• Trombone
Cup diameter26.26 mm / 1.0339 in
Best suited for
Orchestral playing — large cup for full, dark tone
High-volume projection — open throat for power
vs
Mouthpiece B
Yamaha SL-53L
• Trombone
Cup diameter25.91 mm / 1.0201 in
Best suited for
High-volume projection — open throat for power
Cup Diameter
The Bach 3G has a cup diameter of 26.26 mm / 1.0339 in compared to 25.91 mm / 1.0201 in on the Yamaha SL-53L — a difference of 0.35 mm / 0.0138 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.