Which has a bigger cup — Bach 18 or Schilke 43A?

The Bach 18 has a cup diameter of 24.20 mm / 0.9528 in compared to 23.57 mm / 0.9280 in on the Schilke 43A — a difference of 0.63 mm / 0.0248 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bach 18 and Schilke 43A?

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

Bach 18 vs Schilke 43A

Name: Schilke 43A
Brand: Schilke

The Bach 18 has a wider cup diameter, the Schilke 43A has a larger throat opening.

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

The width of the rim surface that contacts the lips. Wider rims improve endurance; narrower rims improve flexibility.

Mouthpiece A

Bach 18

• Trombone

Rim width—

Best suited for

📣High-volume projection — open throat for power

Mouthpiece B

Schilke 43A

• Trombone

Rim width—

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 18 details Schilke 43A details Bach 18 equivalents Schilke 43A equivalents

Bach 18 vs Schilke 43A

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Which is better?

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