[ToneDeath]

Exactly what does Alessandro do to Grado headphones other than a name change?

 

[TheMarchingMule]

Supposedly make them less 'Grado' bright and tweak them to be more 'neutral sounding.'

 

[digitalmind]

AFAIK, a guitarist friend of Grado asked him to design a headphone to have a great guitar sound, and the Allesandro was designed. I could be entirely wrong though.