Mercedes-Benz ML320. Manual — part 244

Fig. 65: Identifying Speaker System (LSA) Components Arrangement

SPEAKER SYSTEM (LSA), LOCATION OF COMPONENTS - GF82.62-P-0002-01E

Model 163 with sound system

2001 Mercedes-Benz ML320

1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis

me

Fig. 66: Identifying Speaker System (LSA) Components Location

TABLE OF CONTENTS, FUNCTION DESCRIPTION OF ANTENNA SYSTEM (ATS) - GF82.62-P-0999GHZ

MODEL 163

SOUND AMPLIFIER, POSITION - GF82.62-P-3100-01GH

Fig. 67: Identifying Sound Amplifier Location

SOUND AMPLIFIER, FUNCTION - GF82.62-P-3100-04GH

The data interchange between the sound amplifier (A2/13) and the possible signal sources, e.g.:



Radio (A2) or



COMAND operating, display and control module (A40/3)

is performed via the digital databus (D2B ). Here, both the control information and the signals from the audio
sources (radio, CD, navigation voice command) are sent via the digital databus (D2B ).

Signal processing

In order to make the diverse sound settings possible, the sound amplifier (A2/13) is equipped with a D igital S
ignal P rocessor (DSP ), which performs the entire signal filtering process. In comparison to conventional

Antenna system (ATS), function

GF82.62-P-
0001GH

Survey of system components for antenna
system (ATS),
location/purpose/design/function

GF82.62-P-
9999GHZ

2001 Mercedes-Benz ML320

1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis

me

analog filters, digital filters contain the following significant advantages:



the filter parameters (sound settings) do not alter throughout the period, this thus means that all the
settings can be repeated exactly



low noise level



the component outlay is significantly reduced, as the filter parameters are set by the software and not by
varying component values (resistances, capacitances or inductance values), thus the number of possible
filter settings is increased

Sound optimizations

Each of the six amplifier channels is equipped with an individual compensation, which can, when requested,
rectify the vehicle's acoustics. In addition further sound optimization settings can be made and effects such as,
e.g. 'voice emphasizing' or 'stereoscopic sound' invoked.

Bass, treble, volume, balance, fader and the dynamic loudness function can be individually set.

Noise suppression

The output level of the six 6 output stages is constantly monitored and regulated such that distortion is kept to a
minimum.

Automatic Vehicle Noise Compensation (VNC))

With the aid of the sound amplifier microphone (B25/6) , which is connected directly to the sound amplifier
(A2/13) , the noise level in the vehicle is measured. The volume of the music output signal is constantly adapted
to this noise level. To this end the sound amplifier (A2/13) must be able to detect which of the measured
signals are noise emissions from the moving vehicle and which are audio signals. This is conducted by
comparing the output signal of the sound amplifier (A2/13) with the measured signal.

Put simply, the vehicle noise level is the difference between the two signals.

Diagnosis

The sound amplifier (A2/13) can set up the following messages which are relevant for the diagnosis:



Operating status



Undervoltage



Internal fault in the sound amplifier (A2/13)

The messages are sent over the digital databus ( D2B ) to the COMAND operating, display and control
module (A40/3) or the radio (A2) , and can be read out there over the ( K-wire ) diagnostics line.

SOUND AMPLIFIER, LOCATION/TASK/DESIGN/FUNCTION - GF82.62-P-3100GH

MODEL 163 with CODE (810) sound system

2001 Mercedes-Benz ML320

1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis

me

REAR WINDOW ANTENNAS, DESIGN - GF82.62-P-3106-03GH

Model 163

Antenna ranges

Sound amplifier,
position

GF82.62-P-3100-
01GH

Sound amplifier, task

Processing (sound settings)
and amplification of all audio
signals (radio, cassette, CD,
navigation voice command,..)

Sound amplifier, design



Digital databus interface
(D2B)



Connection for sound
amplifier microphone
(B25/6) for automatic
vehicle noise
compensation



Digital filter technology



outputs distributed
across following
loudspeaker groups:



Treble



Medium treble



Medium bass



Bass

These are distributed as
follows:
Left front
Right front
Left rear
Rear right
Center
Woofer

Sound amplifier,
function

GF82.62-P-3100-
04GH

2001 Mercedes-Benz ML320

1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis

me