Which has a bigger cup — Bach 6BM or Bach 7BW?

Both mouthpieces have virtually identical cup diameters at 16.20 mm / 0.6378 in.

How does cup depth compare between Bach 6BM and Bach 7BW?

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

Bach 6BM vs Bach 7BW

Name: Bach 7BW
Brand: Bach

the Bach 6BM has a larger throat opening.

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 6BM

• Cornet

Throat diameter3.73 mm / 0.1469 in

Mouthpiece B

Bach 7BW

• Cornet

Throat diameter3.66 mm / 0.1441 in

Throat Diameter

The Bach 6BM has a wider throat (3.73 mm / 0.1469 in vs 3.66 mm / 0.1441 in). A wider throat allows more air through, increasing volume and projection but reducing resistance.

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.