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

The narrowest point at the bottom of the cup. Affects resistance, volume, and tone color.

Mouthpiece A

Yamaha HR-31-GP

• French Horn

Throat diameter4.40 mm / 0.1732 in

Best suited for

📣High-volume projection — open throat for power

Mouthpiece B

Yamaha HR-32-GP

• French Horn

Throat diameter4.40 mm / 0.1732 in

Best suited for

📣High-volume projection — open throat for power

Throat Diameter

Throat diameters are essentially identical at 4.40 mm / 0.1732 in, 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.

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

Throat Diameter

Playing Characteristics

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What Changes If You Switch?

Which is better?

Compare Yamaha HR-31-GP with others

Compare Yamaha HR-32-GP with others

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