Bach 5C vs Bob Reeves 43.5/B/s
The Bob Reeves 43.5/B/s has a wider cup diameter, the Bob Reeves 43.5/B/s features a deeper cup.
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
Bach 5C
• Trumpet
Cup diameter16.25 mm / 0.6398 in
Best suited for
All-round versatile — balanced cup for general playing
vs
Mouthpiece B
Bob Reeves 43.5/B/s
• Trumpet
Cup diameter17.26 mm / 0.6795 in
Best suited for
Orchestral playing — large cup for full, dark tone
Cup Diameter
The Bob Reeves 43.5/B/s has a cup diameter of 17.26 mm / 0.6795 in compared to 16.25 mm / 0.6398 in on the Bach 5C — a difference of 1.01 mm / 0.0398 in. A wider cup generally produces a fuller, darker tone but requires more air support.
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.