Which has a bigger cup — Bach 6¾C or Bach 7?

The Bach 6¾C has a cup diameter of 25.00 mm / 0.9843 in compared to 24.75 mm / 0.9744 in on the Bach 7 — a difference of 0.25 mm / 0.0098 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bach 6¾C and Bach 7?

The Bach 7 has a medium cup while the Bach 6¾C has a shallow cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.

Bach 6¾C vs Bach 7

Name: Bach 7
Brand: Bach

The Bach 6¾C 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 taper behind the throat leading to the shank. Affects projection and tone character.

Mouthpiece A

Bach 6¾C

• Baritone / Euphonium

Backbore—

Best suited for

📣High-volume projection — open throat for power

Mouthpiece B

Bach 7

• Baritone / Euphonium

Backbore—

Best suited for

📣High-volume projection — open throat for power

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.