The order of head units is Chorus, Concert, Symphony and the RNS-E sat /nav unit. As far as speakers are concerned anything from the Concert upwards has 10 active speakers. a Sub/amplifier setup in the luggage compartment, a mid range and a trebble in the rear doors on a 5-door and in the rear side panels on a 3-door. A mid-range in the front doors, a trebble in the A-pillar, and one that is just described (in ETKA) as a loudspeaker in the top centre of the dash.
The BOSE system has different speakers to the standard but in the same locations as far as I know.
The Chorus III has a single CD player with passive speakers.
The Concert III has a single CD player with active front and rear speakers.
The Symphony III has an integrated 6 CD changer with active front and rear speakers.