Which has a bigger cup — Yamaha HR-31-GP or Yamaha HR-32-GP?

The Yamaha HR-32-GP has a cup diameter of 17.48 mm / 0.6882 in compared to 17.28 mm / 0.6803 in on the Yamaha HR-31-GP — a difference of 0.20 mm / 0.0079 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Yamaha HR-31-GP and Yamaha HR-32-GP?

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

Yamaha HR-31-GP vs Yamaha HR-32-GP

Name: Yamaha HR-32-GP
Brand: Yamaha

The Yamaha HR-32-GP has a wider cup diameter.

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

Surface plating or treatment (e.g. silver plate, gold trim). Affects feel, durability, and appearance.

Mouthpiece A

Yamaha HR-31-GP

• French Horn

Finish—

Best suited for

📣High-volume projection — open throat for power

Mouthpiece B

Yamaha HR-32-GP

• French Horn

Finish—

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.