Bach 7 vs Schilke S-H
The Bach 7 has a wider cup diameter, the Bach 7 has a larger throat opening.
Mouthpiece A
Bach 7
• Tuba
Cup diameter33.25 mm / 1.3091 in
Cup depthMedium
Rim width—
Throat diameter9.00 mm / 0.3543 in
Backbore—
Finish—
Material—
Best suited for
High-volume projection — open throat for power
vs
Mouthpiece B
Schilke S-H
• Tuba
Cup diameter31.84 mm / 1.2535 in
Cup depthMedium
Rim width—
Throat diameter7.49 mm / 0.2949 in
BackboreM.295"
Finish—
Material—
Best suited for
High-volume projection — open throat for power
Cup Diameter
The Bach 7 has a cup diameter of 33.25 mm / 1.3091 in compared to 31.84 mm / 1.2535 in on the Schilke S-H — a difference of 1.41 mm / 0.0555 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
Both mouthpieces share a medium cup depth, so the sound character from depth alone will be very similar.
Throat Diameter
The Bach 7 has a wider throat (9.00 mm / 0.3543 in vs 7.49 mm / 0.2949 in). A wider throat allows more air through, increasing volume and projection but reducing resistance.
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.