Which has a bigger cup — Bach 1½C or Bach 1D?

Both mouthpieces have virtually identical cup diameters at 17.00 mm / 0.6693 in.

Bach 1½C vs Bach 1D

Name: Bach 1D
Brand: Bach

the Bach 1½C features a deeper cup.

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 1½C

• Cornet

Cup depthMedium

Mouthpiece B

Bach 1D

• Cornet

Cup depthShallow

Cup Depth

The Bach 1½C has a medium cup while the Bach 1D has a shallow cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.

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.