GR Technologies 66.5MS vs Schilke 13A4a
The GR Technologies 66.5MS has a wider cup diameter, the GR Technologies 66.5MS features a deeper cup.
How deep the cup is, from shallow (brighter, easier high register) to deep (darker, fuller sound).
Mouthpiece A
GR Technologies 66.5MS
• Trumpet
Cup depthMedium
vs
Mouthpiece B
Schilke 13A4a
• Trumpet
Cup depthShallow
Cup Depth
The GR Technologies 66.5MS has a medium cup while the Schilke 13A4a has a shallow cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
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.