Which has a bigger cup — Bob Reeves 40/S/X or Yamaha TR-14B4?

The Yamaha TR-14B4 has a cup diameter of 16.85 mm / 0.6634 in compared to 15.88 mm / 0.6252 in on the Bob Reeves 40/S/X — a difference of 0.97 mm / 0.0382 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bob Reeves 40/S/X and Yamaha TR-14B4?

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

Bob Reeves 40/S/X 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 narrowest point at the bottom of the cup. Affects resistance, volume, and tone color.

Mouthpiece A

Bob Reeves 40/S/X

• Trumpet

Throat diameter—

Best suited for

🎺Lead / commercial — shallow cup for brightness and range

Mouthpiece B

Yamaha TR-14B4

• Trumpet

Throat diameter3.65 mm / 0.1437 in

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.