Bach 18C vs Denis Wick 6BM
The Denis Wick 6BM has a wider cup diameter, the Denis Wick 6BM features a deeper cup, the Denis Wick 6BM has a larger throat opening.
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
Bach 18C
• Baritone / Euphonium
Cup diameter24.20 mm / 0.9528 in
Best suited for
High-volume projection — open throat for power
vs
Mouthpiece B
Denis Wick 6BM
• Baritone / Euphonium
Cup diameter25.40 mm / 1.0000 in
Best suited for
High-volume projection — open throat for power
Cup Diameter
The Denis Wick 6BM has a cup diameter of 25.40 mm / 1.0000 in compared to 24.20 mm / 0.9528 in on the Bach 18C — a difference of 1.20 mm / 0.0472 in. A wider cup generally produces a fuller, darker tone but requires more air support.
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.