Which has a bigger cup — Bach 2½C or Bach 7?

The Bach 2½C has a cup diameter of 16.40 mm / 0.6457 in compared to 16.20 mm / 0.6378 in on the Bach 7 — a difference of 0.20 mm / 0.0079 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bach 2½C and Bach 7?

The Bach 7 has a very deep cup while the Bach 2½C has a medium cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.

Bach 2½C vs Bach 7

Name: Bach 7
Brand: Bach

The Bach 2½C has a wider cup diameter, the Bach 7 features a deeper cup.

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 2½C

• Cornet

Throat diameter3.66 mm / 0.1441 in

Best suited for

🎵All-round versatile — balanced cup for general playing

Mouthpiece B

Bach 7

• Cornet

Throat diameter3.66 mm / 0.1441 in

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.