Top-Hifi Amplifier - BMW E85 Manual

E85 Information/Communication

- Top-HiFi amplifier

The Top-HiFi amplifier is also controlled via the radio.
The Top-HiFi amplifier receives a constant audio signal for the
left and right (via the two audio inputs) from the radio. The
required settings are transferred via the K-bus and formed in the
amplifier.
The following functions can be set:
- Volume
- Bass
- Treble
- Balance (left/right)
- Fader (front/rear)
In addition, the overall acoustics can be set individually (CID
only) by means of a 7-band graphic equalizer.
Deactivation of the Top-HiFi amplifier during a telephone call
If the vehicle is equipped with a telephone, the telephone
control unit switches off the Top-HiFi amplifier inputs in the
event of a telephone call.
The inputs are switched off by the "Tel-Mute" signal.
The Tel-Mute input is a separate input. To ensure the inputs are
switched off immediately, the signal is transferred on a separate
line (not on the K-bus).
If the signal were transmitted via the K-bus, delays could occur
in switching off the inputs when the load on the K-bus is high.
Consequently, this would cause disturbance of the telephone
call.
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