Which has a bigger cup — Yamaha TR-11B4-GP or Yamaha TR-13B4?

The Yamaha TR-13B4 has a cup diameter of 16.63 mm / 0.6547 in compared to 16.46 mm / 0.6480 in on the Yamaha TR-11B4-GP — a difference of 0.17 mm / 0.0067 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Yamaha TR-11B4-GP and Yamaha TR-13B4?

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

Yamaha TR-11B4-GP vs Yamaha TR-13B4

Name: Yamaha TR-13B4
Brand: Yamaha

The Yamaha TR-13B4 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 TR-11B4-GP

• Trumpet

Throat diameter3.65 mm / 0.1437 in

Mouthpiece B

Yamaha TR-13B4

• Trumpet

Throat diameter3.65 mm / 0.1437 in

Throat Diameter

Throat diameters are essentially identical at 3.65 mm / 0.1437 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.