Infotainment�2018
6.�Audio�Systems
48
6.1.�Introduction
In�vehicles�with�a
�Head�Unit�High�3�(HU-H3)
�there�are�some�changes�and�new�features�in�relation�to
the�audio�systems.
The�audio�systems�receive�some�new�features�with�the�Service�Pack�2018.�For�example,�tuners�are
no�longer�integrated�in�the�Head�Unit�High�3�(HU-H3).�They�are�located�in�a�separate,�new�control�unit,
the�Receiver�Audio�Module�
(RAM)
.
The�previous�audio�amplifiers�are�replaced�with�a�new�control�unit,�the�
Booster
�(in�different�versions).
In�this�product�information�the�combination�options�of�RAM�and�Booster�are�explained.�A�description
of�the�specific�speaker�systems�and�the�installation�locations�of�the�control�units�can�be�found�in�the
vehicle-specific�product�information�G05/G15�Infotainment.
6.2.�Receiver�Audio�Module
The�Receiver�Audio�Module�(RAM)�is�a�new�control�unit�in�the�vehicles.�It�is�used�in�conjunction�with
the�Head�Unit�High�3�(HU-H3).
Here�it�is�an�audio�amplifier�with�integrated�tuners�and�sound�processor�and�a�range�of�other�additional
interface�functions.�This�also�includes�the�sound�generation�of�the�turn�indicator�in�the�instrument
cluster.�The�sound�is�not�generated�in�the�instrument�cluster,�but�in�the�Receiver�Audio�Module�(RAM).
The�RAM�contains�the�following�functions�in�the�maximum�equipment:
•
AM/FM�tuner
•
Aerial�diversity�for�AM/FM
•
Audio�amplifier
•
Active�Sound�Design.
The�RAM�makes�available�the�data�to�the�head�unit�via�an�Ethernet�connection.
The�loudspeakers�are�connected�directly�at�the�Receiver�Audio�Module�(RAM)�for�a�stereo�or�hi-fi
system�(NF�lines).�The�sound�signals�for�the�optional�equipment�Harman�Kardon�surround�sound
system�are�partly�transmitted�via�the�Receiver�Audio�Module�and�partly�via�the�Booster.�The�bass
speakers�are�connected�at�the�Booster,�the�mid-range�speakers�as�well�as�the�tweeters�are�connected
at�the�RAM.
The�Booster�is�connected�directly�to�the�RAM�via�an�Ethernet�connection.
