Which has a bigger cup — Bach 12C or Schilke 51?

The Schilke 51 has a cup diameter of 25.63 mm / 1.0091 in compared to 24.50 mm / 0.9646 in on the Bach 12C — a difference of 1.13 mm / 0.0445 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bach 12C and Schilke 51?

The Schilke 51 has a medium cup while the Bach 12C has a shallow cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.

Bach 12C vs Schilke 51

Name: Schilke 51
Brand: Schilke

The Schilke 51 has a wider cup diameter, the Schilke 51 features a deeper cup, the Schilke 51 has a larger throat opening.

Overall Comparison Cup Diameter Cup Depth Rim Width Throat Diameter Backbore Finish Material

The taper behind the throat leading to the shank. Affects projection and tone character.

Mouthpiece A

Bach 12C

• Trombone

Backbore—

Best suited for

📣High-volume projection — open throat for power

Mouthpiece B

Schilke 51

• Trombone

BackboreJ .277"

Best suited for

📣High-volume projection — open throat for power

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.

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Bach 12C vs Schilke 51

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Which is better?

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