Control Module
The subwoofer module (SUB) contains:
- a loudspeaker element
- an amplifier.
The loudspeaker element is an 8 inch bass loudspeaker with two voice coils. The impedance is 4 Ω for each voice coil.
The amplifier has two channels, one for each sound axis. The output from each channel on the amplifier is 70 W at 4 Ω. Power booster amplification is set so that the acoustic output from the subwoofer module (SUB) matches the other loudspeaker channels.
When transferring sound signals to the subwoofer module (SUB), the infotainment control module (ICM) allocates a channel on the MOST network. The audio module (AUD) transmits sound signals to the subwoofer module (SUB) via the MOST network. All filtering and sound treatment of the sound signal takes place in the audio module (AUD). Volume control takes place in the subwoofer module (SUB).
The volume of the subwoofer module (SUB) is raised or lowered using the volume knob on the infotainment control module (ICM). The infotainment control module (ICM) transmits a request on the MOST network to the subwoofer module (SUB), which then processes the request and actively raises or lowers the volume.
The limiter function in the subwoofer module (SUB) does not permit an increase in the output level if this would lead to a fall in sound quality.
The subwoofer module (SUB) is powered via the central electronic module (CEM).