Bach 30CB vs Schilke 45B
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
Schilke 45B
• Trombone
Cup diameter24.30 mm / 0.9567 in
Cup depthMedium
Rim width—
Throat diameter5.95 mm / 0.2343 in
Backbore15/64 .2344"
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 24.30 mm / 0.9567 in on the Schilke 45B — a difference of 5.70 mm / 0.2244 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 Schilke 45B 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.
Compare Bach 30CB with others
Compare Schilke 45B with others
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