Bach 1 vs Yamaha TR-15E4
The Bach 1 has a wider cup diameter, the Yamaha TR-15E4 has a larger throat opening.
How deep the cup is, from shallow (brighter, easier high register) to deep (darker, fuller sound).
Mouthpiece A
Bach 1
• Trumpet
Cup depthVery deep
Best suited for
Orchestral playing — large cup for full, dark tone
vs
Mouthpiece B
Yamaha TR-15E4
• Trumpet
Cup depthVery deep
Best suited for
Orchestral playing — large cup for full, dark tone
High-volume projection — open throat for power
Cup Depth
Both mouthpieces share a very deep 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.