Bach 30E vs Bach 32E
The Bach 30E has a wider cup diameter.
Mouthpiece A
Bach 30E
• Tuba
Cup diameter30.00 mm / 1.1811 in
Cup depthShallow
Rim width—
Throat diameter8.33 mm / 0.3280 in
Backbore—
Finish—
Material—
Best suited for
High-volume projection — open throat for power
vs
Mouthpiece B
Bach 32E
• Tuba
Cup diameter29.50 mm / 1.1614 in
Cup depthShallow
Rim width—
Throat diameter8.33 mm / 0.3280 in
Backbore—
Finish—
Material—
Best suited for
High-volume projection — open throat for power
Cup Diameter
The Bach 30E has a cup diameter of 30.00 mm / 1.1811 in compared to 29.50 mm / 1.1614 in on the Bach 32E — a difference of 0.50 mm / 0.0197 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
Both mouthpieces share a shallow cup depth, so the sound character from depth alone will be very similar.
Throat Diameter
Throat diameters are essentially identical at 8.33 mm / 0.3280 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.