Which has a bigger cup — Bach 11B or Bach 1B?

The Bach 1B has a cup diameter of 17.00 mm / 0.6693 in compared to 15.70 mm / 0.6181 in on the Bach 11B — a difference of 1.30 mm / 0.0512 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bach 11B and Bach 1B?

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

Bach 11B 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 narrowest point at the bottom of the cup. Affects resistance, volume, and tone color.

Mouthpiece A

Bach 11B

• Cornet

Throat diameter3.66 mm / 0.1441 in

Mouthpiece B

Bach 1B

• Cornet

Throat diameter3.66 mm / 0.1441 in

Best suited for

🎻Orchestral playing — large cup for full, dark tone

Throat Diameter

Throat diameters are essentially identical at 3.66 mm / 0.1441 in, so resistance feel will be comparable.

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.