Which has a bigger cup — Bach 10¾CW or Bach 17C?

The Bach 10¾CW has a cup diameter of 15.75 mm / 0.6201 in compared to 15.10 mm / 0.5945 in on the Bach 17C — a difference of 0.65 mm / 0.0256 in. A wider cup generally produces a fuller, darker tone but requires more air support.

Bach 10¾CW vs Bach 17C

Name: Bach 17C
Brand: Bach

The Bach 10¾CW has a wider cup diameter.

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 10¾CW

• Cornet

Cup depthMedium

Mouthpiece B

Bach 17C

• Cornet

Cup depthMedium

Cup Depth

Both mouthpieces share a medium 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.