Bob Reeves RP5 vs GR Technologies 65SZ
The GR Technologies 65SZ has a wider cup diameter.
How deep the cup is, from shallow (brighter, easier high register) to deep (darker, fuller sound).
Mouthpiece A
Bob Reeves RP5
• Trumpet
Cup depthShallow
vs
Mouthpiece B
GR Technologies 65SZ
• 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.