Comming on to stock ice.
Have heard songs both in base and top end version
I though the difference is only in head unit
base is normal head unit , but the top end have a head unit with blue tooth option.
But i think the speakers are also different.
though both the sets are from blaupunk ,
speakers do differ , because , the sound in top end version was good , but in mine , when i rise the volume , its not crisp as in top end version , also there is some scattering like.!