Bach 5GB (large shank) vs Bach 5GL
the Bach 5GB (large shank) features a deeper cup.
Mouthpiece A
Bach 5GB (large shank)
• Trombone
Cup diameter25.50 mm / 1.0039 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
Bach 5GL
• Trombone
Cup diameter25.50 mm / 1.0039 in
Cup depthDeep
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
Cup Diameter
Both mouthpieces have virtually identical cup diameters at 25.50 mm / 1.0039 in.
Cup Depth
The Bach 5GB (large shank) has a very deep cup while the Bach 5GL has a deep cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
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.