Bob Reeves 4G vs Bob Reeves 5G
The Bob Reeves 4G has a wider cup diameter, the Bob Reeves 4G features a deeper cup.
Mouthpiece A
Bob Reeves 4G
• Trombone
Cup diameter26.00 mm / 1.0236 in
Cup depthVery deep
Rim width—
Throat diameter—
Backbore—
Finish—
Material—
Best suited for
Orchestral playing — large cup for full, dark tone
vs
Mouthpiece B
Bob Reeves 5G
• Trombone
Cup diameter25.55 mm / 1.0059 in
Cup depthDeep
Rim width—
Throat diameter—
Backbore—
Finish—
Material—
Best suited for
Orchestral playing — large cup for full, dark tone
Cup Diameter
The Bob Reeves 4G has a cup diameter of 26.00 mm / 1.0236 in compared to 25.55 mm / 1.0059 in on the Bob Reeves 5G — a difference of 0.45 mm / 0.0177 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Bob Reeves 4G has a very deep cup while the Bob Reeves 5G has a deep 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.