Which has a bigger cup — Bob Reeves RP5 or Yamaha TR-14B4?

The Yamaha TR-14B4 has a cup diameter of 16.85 mm / 0.6634 in compared to 16.47 mm / 0.6484 in on the Bob Reeves RP5 — a difference of 0.38 mm / 0.0150 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bob Reeves RP5 and Yamaha TR-14B4?

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

Bob Reeves RP5 vs Yamaha TR-14B4

Name: Yamaha TR-14B4
Brand: Yamaha

The Yamaha TR-14B4 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

Bob Reeves RP5

• Trumpet

Backbore—

Mouthpiece B

Yamaha TR-14B4

• Trumpet

BackboreSemi-narrow

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.