Bach 17D vs Denis Wick TH5
The Bach 17D has a wider cup diameter, the Denis Wick TH5 features a deeper cup, the Bach 17D has a larger throat opening.
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
Bach 17D
• Baritone / Euphonium
Cup diameter24.20 mm / 0.9528 in
Best suited for
High-volume projection — open throat for power
vs
Mouthpiece B
Denis Wick TH5
• Baritone / Euphonium
Cup diameter17.50 mm / 0.6890 in
Best suited for
Orchestral playing — large cup for full, dark tone
High-volume projection — open throat for power
Cup Diameter
The Bach 17D has a cup diameter of 24.20 mm / 0.9528 in compared to 17.50 mm / 0.6890 in on the Denis Wick TH5 — a difference of 6.70 mm / 0.2638 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.