Which has a bigger cup — Bach 12B or Bach 1B?

The Bach 1B has a cup diameter of 17.00 mm / 0.6693 in compared to 15.20 mm / 0.5984 in on the Bach 12B — a difference of 1.80 mm / 0.0709 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bach 12B and Bach 1B?

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

Bach 12B vs Bach 1B

Name: Bach 1B
Brand: Bach

The Bach 1B has a wider cup diameter.

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 12B

• Cornet

Backbore—

Mouthpiece B

Bach 1B

• Cornet

Backbore—

Best suited for

🎻Orchestral playing — large cup for full, dark tone

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.