Which has a bigger cup — Bach 12C or Schilke 51C4?

The Schilke 51C4 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.

Bach 12C vs Schilke 51C4

Name: Schilke 51C4
Brand: Schilke

The Schilke 51C4 has a wider cup diameter, the Schilke 51C4 has a larger throat opening.

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

How deep the cup is, from shallow (brighter, easier high register) to deep (darker, fuller sound).

Mouthpiece A

Bach 12C

• Trombone

Cup depthShallow

Best suited for

📣High-volume projection — open throat for power

Mouthpiece B

Schilke 51C4

• Trombone

Cup depthShallow

Best suited for

📣High-volume projection — open throat for power

Cup Depth

Both mouthpieces share a shallow cup depth, so the sound character from depth alone will be very similar.

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.

Open in interactive tool + Add third mouthpiece Bach 12C details Schilke 51C4 details Bach 12C equivalents Schilke 51C4 equivalents

Bach 12C vs Schilke 51C4

Cup Depth

Playing Characteristics

What Do These Model Names Mean?

What Changes If You Switch?

Which is better?

Compare Bach 12C with others

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