Which has a bigger cup — Bach 12C or Schilke 45B?

The Bach 12C has a cup diameter of 24.50 mm / 0.9646 in compared to 24.30 mm / 0.9567 in on the Schilke 45B — a difference of 0.20 mm / 0.0079 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 45B?

The Schilke 45B 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 45B

Name: Schilke 45B
Brand: Schilke

The Bach 12C has a wider cup diameter, the Schilke 45B features a deeper cup, the Schilke 45B has a larger throat opening.

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

Surface plating or treatment (e.g. silver plate, gold trim). Affects feel, durability, and appearance.

Mouthpiece A

Bach 12C

• Trombone

Finish—

Best suited for

📣High-volume projection — open throat for power

Mouthpiece B

Schilke 45B

• Trombone

Finish—

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.

Open in interactive tool + Add third mouthpiece Bach 12C details Schilke 45B details Bach 12C equivalents Schilke 45B equivalents

Bach 12C vs Schilke 45B

Playing Characteristics

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What Changes If You Switch?

Which is better?

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