I played on a 12C in school, but in comparison, I get so much more sound and a better tone with the 61/2 AL

Instantly he had a much louder sound with smoother tone.

The deeper cup (than the 12C) will greatly improve tone, although be aware, range will temporarily drop and you may experience fatigue

I definitely notice a better tone and bigger sound when he practices

Tone is great.

Good mouthpiece, very clear tone