Bach 4G vs Giardinelli 3G
Both mouthpieces share similar core dimensions — the differences are in the details.
Mouthpiece A
Bach 4G
• Trombone
Cup diameter26.00 mm / 1.0236 in
Cup depthVery deep
Rim width—
Throat diameter7.01 mm / 0.2760 in
Backbore—
Finish—
Material—
Best suited for
Orchestral playing — large cup for full, dark tone
High-volume projection — open throat for power
vs
Mouthpiece B
Giardinelli 3G
• Trombone
Cup diameter26.00 mm / 1.0236 in
Cup depthVery deep
Rim width—
Throat diameter7.00 mm / 0.2756 in
BackboreJ (.277)"
Finish—
Material—
Best suited for
Orchestral playing — large cup for full, dark tone
High-volume projection — open throat for power
Cup Diameter
Both mouthpieces have virtually identical cup diameters at 26.00 mm / 1.0236 in.
Cup Depth
Both mouthpieces share a very deep cup depth, so the sound character from depth alone will be very similar.
Throat Diameter
Throat diameters are essentially identical at 7.01 mm / 0.2760 in, so resistance feel will be comparable.
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.