Which has a bigger cup — Bob Reeves RP4 or Yamaha TR-14B4?

The Yamaha TR-14B4 has a cup diameter of 16.85 mm / 0.6634 in compared to 16.27 mm / 0.6406 in on the Bob Reeves RP4 — a difference of 0.58 mm / 0.0228 in. A wider cup generally produces a fuller, darker tone but requires more air support.

Bob Reeves RP4 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

How deep the cup is, from shallow (brighter, easier high register) to deep (darker, fuller sound).

Mouthpiece A

Bob Reeves RP4

• Trumpet

Cup depthShallow

Mouthpiece B

Yamaha TR-14B4

• Trumpet

Cup depthShallow

Cup Depth

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

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 Bob Reeves RP4 details Yamaha TR-14B4 details Bob Reeves RP4 equivalents Yamaha TR-14B4 equivalents

Bob Reeves RP4 vs Yamaha TR-14B4

Cup Depth

Playing Characteristics

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Which is better?

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