Bach 8 vs Giardinelli 6M
The Bach 8 has a wider cup diameter, the Bach 8 has a larger throat opening.
Mouthpiece A
Bach 8
• Baritone / Euphonium
Cup diameter24.75 mm / 0.9744 in
Cup depthMedium
Rim width—
Throat diameter5.85 mm / 0.2303 in
Backbore—
Finish—
Material—
Best suited for
High-volume projection — open throat for power
vs
Mouthpiece B
Giardinelli 6M
• Baritone / Euphonium
Cup diameter24.50 mm / 0.9646 in
Cup depthMedium
Rim width—
Throat diameter5.75 mm / 0.2264 in
Backbore.228"
Finish—
Material—
Best suited for
High-volume projection — open throat for power
Cup Diameter
The Bach 8 has a cup diameter of 24.75 mm / 0.9744 in compared to 24.50 mm / 0.9646 in on the Giardinelli 6M — a difference of 0.25 mm / 0.0098 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 8 has a wider throat (5.85 mm / 0.2303 in vs 5.75 mm / 0.2264 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.