Bach 1½C vs Bob Reeves 42/B/s
The Bach 1½C has a wider cup diameter, the Bob Reeves 42/B/s features a deeper cup.
Mouthpiece A
Bach 1½C
• Cornet
Cup diameter17.00 mm / 0.6693 in
Cup depthMedium
Rim width—
Throat diameter3.66 mm / 0.1441 in
Backbore—
Finish—
Material—
vs
Mouthpiece B
Bob Reeves 42/B/s
• Cornet
Cup diameter16.67 mm / 0.6563 in
Cup depthVery deep
Rim width—
Throat diameter—
Backbores
Finish—
Material—
Cup Diameter
The Bach 1½C has a cup diameter of 17.00 mm / 0.6693 in compared to 16.67 mm / 0.6563 in on the Bob Reeves 42/B/s — a difference of 0.33 mm / 0.0130 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Bob Reeves 42/B/s has a very deep cup while the Bach 1½C has a medium cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
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.