Which has a bigger cup — Bach 18 or Yamaha HR-35C4?

The Yamaha HR-35C4 has a cup diameter of 18.08 mm / 0.7118 in compared to 16.15 mm / 0.6358 in on the Bach 18 — a difference of 1.93 mm / 0.0760 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bach 18 and Yamaha HR-35C4?

Both mouthpieces share a medium cup depth, so the sound character from depth alone will be very similar.

Bach 18 vs Yamaha HR-35C4

Name: Yamaha HR-35C4
Brand: Yamaha

The Yamaha HR-35C4 has a wider cup diameter, the Bach 18 has a larger throat opening.

Overall Comparison Cup Diameter Cup Depth Rim Width Throat Diameter Backbore Finish Material

The taper behind the throat leading to the shank. Affects projection and tone character.

Mouthpiece A

Bach 18

• French Horn

Backbore—

Best suited for

🎵All-round versatile — balanced cup for general playing

📣High-volume projection — open throat for power

Mouthpiece B

Yamaha HR-35C4

• French Horn

BackboreStandard

Best suited for

📣High-volume projection — open throat for power

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.

Open in interactive tool + Add third mouthpiece Bach 18 details Yamaha HR-35C4 details Bach 18 equivalents Yamaha HR-35C4 equivalents

Bach 18 vs Yamaha HR-35C4

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