Bach 18 vs Yamaha HR-31D4
The Yamaha HR-31D4 has a wider cup diameter, the Yamaha HR-31D4 features a deeper cup.
The narrowest point at the bottom of the cup. Affects resistance, volume, and tone color.
Mouthpiece A
Bach 18
• French Horn
Throat diameter4.50 mm
Best suited for
All-round versatile — balanced cup for general playing
High-volume projection — open throat for power
vs
Mouthpiece B
Yamaha HR-31D4
• French Horn
Throat diameter4.50 mm
Best suited for
Orchestral playing — large cup for full, dark tone
High-volume projection — open throat for power
Throat Diameter
Throat diameters are essentially identical at 4.50 mm, 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.