Bob Reeves 4G-5G vs Giardinelli 2G
The Giardinelli 2G has a wider cup diameter, the Giardinelli 2G features a deeper cup.
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
Bob Reeves 4G-5G
• Trombone
Cup diameter26.00 mm / 1.0236 in
Best suited for
Orchestral playing — large cup for full, dark tone
vs
Mouthpiece B
Giardinelli 2G
• Trombone
Cup diameter26.50 mm / 1.0433 in
Best suited for
Orchestral playing — large cup for full, dark tone
High-volume projection — open throat for power
Cup Diameter
The Giardinelli 2G has a cup diameter of 26.50 mm / 1.0433 in compared to 26.00 mm / 1.0236 in on the Bob Reeves 4G-5G — a difference of 0.50 mm / 0.0197 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.