Bach 4GB vs Bob Reeves 5G Gladstone
The Bach 4GB has a wider cup diameter, the Bach 4GB features a deeper cup.
Mouthpiece A
Bach 4GB
• Trombone
Cup diameter26.00 mm
Cup depthVery deep
Rim width—
Throat diameter7.01 mm
Backbore—
Finish—
Material—
Best suited for
Orchestral playing — large cup for full, dark tone
High-volume projection — open throat for power
vs
Mouthpiece B
Bob Reeves 5G Gladstone
• Trombone
Cup diameter25.55 mm
Cup depthDeep
Rim width—
Throat diameter—
Backbore—
Finish—
Material—
Best suited for
Orchestral playing — large cup for full, dark tone
Cup Diameter
The Bach 4GB has a cup diameter of 26.00 mm compared to 25.55 mm on the Bob Reeves 5G Gladstone — a difference of +0.45 mm. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Bach 4GB has a very deep cup while the Bob Reeves 5G Gladstone 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.
Compare Bach 4GB with others
Compare Bob Reeves 5G Gladstone with others
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