Bach 30CB vs Yamaha SL-53L
The Bach 30CB has a wider cup diameter, the Bach 30CB features a deeper cup.
Mouthpiece A
Bach 30CB
• Trombone
Cup diameter30.00 mm / 1.1811 in
Cup depthVery deep
Rim width—
Throat diameter—
Backbore—
Finish—
Material—
Best suited for
Orchestral playing — large cup for full, dark tone
vs
Mouthpiece B
Yamaha SL-53L
• Trombone
Cup diameter25.91 mm / 1.0201 in
Cup depthMedium
Rim width—
Throat diameter7.11 mm / 0.2799 in
BackboreSemi-wide
Finish—
Material—
Best suited for
High-volume projection — open throat for power
Cup Diameter
The Bach 30CB has a cup diameter of 30.00 mm / 1.1811 in compared to 25.91 mm / 1.0201 in on the Yamaha SL-53L — a difference of 4.09 mm / 0.1610 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Bach 30CB has a very deep cup while the Yamaha SL-53L has a medium cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
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.