Bach 12E vs Giardinelli 3M
The Giardinelli 3M has a wider cup diameter, the Giardinelli 3M features a deeper cup, the Giardinelli 3M has a larger throat opening.
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
Bach 12E
• Trombone
Cup diameter24.50 mm / 0.9646 in
Best suited for
High-volume projection — open throat for power
vs
Mouthpiece B
Giardinelli 3M
• Trombone
Cup diameter26.30 mm / 1.0354 in
Best suited for
High-volume projection — open throat for power
Cup Diameter
The Giardinelli 3M has a cup diameter of 26.30 mm / 1.0354 in compared to 24.50 mm / 0.9646 in on the Bach 12E — a difference of 1.80 mm / 0.0709 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.