Top-Hifi System - BMW E90 Manual

Top-HiFi System

The digital 'Top-HiFi' amplifier with Logic7 (Surround Sound) is of identical design to that
used in the E60 and the E63/4. This amplifier is a MOST bus node and can be operated
only with radios or navigation systems with MOST capabilities.
The audio signals are sent in digital form via the fibre-optic cable (MOST bus) from the
radio or navigation systems to the 'Top-HiFi' amplifier. The amplifier converts the digital
signals to analogue signals, amplifies them and routes them to the speakers.
The sound adjustment (7-band equalizer, spatial sound, fader etc.) takes place prior to the
analogue conversion in the digital signal processor (DSP) of the amplifier. The Top-HiFi
amplifier is installed in the same location as the HiFi amplifier.
Top-HiFi Amplifier Mounting Location
Index Explanation
1
Logic7 amplifier
A total of 13 speakers are driven by 9 audio channels:
• A high-range and mid-range speaker in each front door
• A tweeter and a mid-range speaker on each side of the rear shelf
• A mid-range speaker in each rear door
• A mid-range speaker in the dashboard (Surround Sound)
• A central bass speaker under each front seat
12
E90 Communication