Which has a bigger cup — Yamaha BB-64 or Yamaha BB-65?

The Yamaha BB-65 has a cup diameter of 30.95 mm / 1.2185 in compared to 30.45 mm / 1.1988 in on the Yamaha BB-64 — a difference of 0.50 mm / 0.0197 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Yamaha BB-64 and Yamaha BB-65?

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

Yamaha BB-64 vs Yamaha BB-65

Name: Yamaha BB-65
Brand: Yamaha

The Yamaha BB-65 has a wider cup diameter.

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

Yamaha BB-64

• Tuba

BackboreStandard

Best suited for

📣High-volume projection — open throat for power

Mouthpiece B

Yamaha BB-65

• Tuba

BackboreSemi-wide

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.