Which has a bigger cup — Bach 1½C or Bob Reeves 40/M/2?

The Bach 1½C has a cup diameter of 17.00 mm / 0.6693 in compared to 15.88 mm / 0.6252 in on the Bob Reeves 40/M/2 — a difference of 1.12 mm / 0.0441 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bach 1½C and Bob Reeves 40/M/2?

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

Bach 1½C vs Bob Reeves 40/M/2

Name: Bob Reeves 40/M/2
Brand: Bob Reeves

The Bach 1½C 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 1½C

• Cornet

Backbore—

Mouthpiece B

Bob Reeves 40/M/2

• Cornet

Backbore2

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.