Which has a bigger cup — Bach 17 or Schilke 43A?

The Bach 17 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 17 and Schilke 43A?

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

Bach 17 vs Schilke 43A

Name: Schilke 43A
Brand: Schilke

The Bach 17 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 taper behind the throat leading to the shank. Affects projection and tone character.

Mouthpiece A

Bach 17

• Trombone

Backbore—

Best suited for

📣High-volume projection — open throat for power

Mouthpiece B

Schilke 43A

• Trombone

Backbore15/64 .2344"

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.