Volume/tone adjustments, function with CODE (525) MB Audio 50 APS radio - GF82.60-P-2003SK
MODEL 171.4 with CODE (525) MB Audio 50 APS radio
All volume and tone settings are performed by the radio and navigation unit (A2/56) and transmitted to the audio gateway control unit (N93/1) via the media-oriented system transport (MOST). It is necessary to differentiate between audio sources and service sources: Audio sources are:
- CD disk drive
- Cassette tape drive
- Radio
Service sources are:
- Traffic radio announcements
- Telephone (TEL) and voice control system (VCS)
Volume setting
The volume of whatever audio source can be adjusted using the rotary switch on the radio and navigation unit (A2/56). In addition, it can be set separately in all audio and service areas (telephone, traffic information radio channel). Via the soft key assignment "Volume", it is possible to increase or decrease the volume of the traffic information. Using the RESET function, predefined settings for the sound parameters including volume can be selected and reset to the manufacturer default settings.
Speed-dependent volume control (SDV)
The volume is adapted to the noise situation in the interior using the speed-dependent volume control. The vehicle speed signal is used as a relationship indicator by the instrument cluster (A1) when doing this.
In vehicles with code (810) Sound system up to 31.8.06, the speed-dependent volume control is supplemented by automatic vehicle interior noise adaptation. The signal input at the sound amplifier microphone (B25/6) is used as another relationship indicator when doing this.
Mute
If the user presses the function key "Mute", the audio source currently being listened to is muted and the CD drive changes to a pause status. The "muting" function status can also be triggered automatically. The radio and navigation unit (A2/56) switches to telephone mode when a call is received and mutes the audio source.
Tone setting
The radio and navigation unit (A2/56) allows manual tone settings to be made (bass, treble, balance, fader) for each audio source. The "AUDIO" function status can be reached from any other function status (except "AUTO-ON"). The bass is shown on the display as the first tone setting called up. By pressing the AUDIO function key repeatedly, the other tone controls for treble, balance (left/right), fader (front/rear), increased volume and traffic announcements can be called up. The messages of the AUDIO function status are output in the display field. The tone control only relates to the active system function status. If the tone emphasis is changed (balance, fader) the volume relationship between the individual speakers changes relative to each other. The "Balance" and "Fading" adjustments can be achieved by pressing the main key for sound distribution in the left control panel.
The signal processing required for the volume and sound settings is performed via the audio component integrated into the audio gateway control unit (N93/1).
If the vehicle is equipped with the audio gateway control unit (N93/1) with code (810) Sound system, further final amplification of the audio signals is possible by way of the digital sound processor with the enhanced sound processing and amplifier stage and the additional surround sound settings.
| Radio mode, function | GF82.60-P-2001SK | |
| CD-player mode, function | up to 31.5.05 | GF82.60-P-2002SK |
| as of 1.6.05 | GF82.60-P-2002SKE | |
| Cassette mode, function | GF82.85-P-2010SK | |
| Telephone mode, function | with code (388) Universal Portable CTEL Interface System | GF82.85-P-2007SK |
| Data exchange between the operating unit and instrument cluster, function | GF82.85-P-3004SK |