What is the difference between the various radio systems offered?

There are two radios, two nav systems and three sound systems (speakers/amps).

The basic/standard radio in Europe is Business Radio. Professional Radio is the better one which has two tuners, supports RDS and other stuff like MP3 playback.

NAV is available as Business NAV and Professional NAV. Business NAV has no map, just arrows, and is not available in the US. Both NAV systems come with Professional Radio standard.

The available sound systems are: Standard, Hi-Fi and Logic7.

So there are E60's with:
radio bus, no nav
radio pro, no nav
radio pro, nav bus
radio pro, nav pro

Each of the above combinations can be combined with standard sound, Hi-Fi or Logic7.

For MP3 playback the Professional Radio is required.

 

What's the difference between standard, hi-fi and logic7?