System Description: Overview: Notes

There are two audio systems available for the RDX:

• The premium audio system is on vehicles without navigation. It includes six speakers, a subwoofer, and an XM receiver.
• The ELS audio system is available on vehicles with navigation. It includes surround sound with nine speakers (the same six that are available on the premium audio system, plus one in each rear door and in the middle of the front dash), a subwoofer, and AcuraLink (HIP/XM receiver).

The audio unit acts as the processor for all audio functions. You can select the audio functions from the front panel, the audio remote (on steering wheel), or by using the navigation voice control system. The audio display provides the current front and rear audio status. For vehicles with the navigation option, additional audio information is available by touching the audio button. (See the owner's manual for more details.)

Each audio component passes its audio signal to the audio unit. In addition, it communicates with the audio unit via the GA-Net bus. Any open connection in this circuit will cause audio and navigation functions to appear inoperative.

The audio unit has a built-in EEPROM (electrically erasable programmable read-only memory). This memory holds the audio preset data (AM/FM radio frequency, sound settings, etc.) even when the battery is disconnected.

With the ELS and the premium audio system, an audio amplifier unit powers the speakers.

The audio systems are equipped with speed-sensitive volume compensation (SVC). The audio unit receives the vehicle speed pulse (VSP) from the PCM. The system processes the speed input and increases the navigation or audio system volume level as the vehicle speed increases to compensate for the various interior noise that occurs at higher speeds. When the vehicle slows down, the volume returns to its normal level. The SVC has four settings: SVC OFF, LOW, MID and HIGH that can be adjusted using the audio unit. The SVC comes from the factory with the MID set as the default (See the owner's manual for more details.)

The 6DVD (6CD) changer output can be directed to the audio unit.

The XM radio plays through the audio unit.

A security signal is daisy-chained between the audio and navigation components and integrated into the vehicle's security system.

The optional navigation system provides voice control for the audio, the XM, and the CD player. Voice control commands are communicated through the GA-Net (audio unit). When using the TALK/BACK or route guidance (RG), the center speaker is muted and you hear the navigation instructions through the front speakers. When using the HFL/ AcuraLink, the center speaker, the rear speakers, and the subwoofer are muted and the front speakers give the telephone sound. When using the HFL/AcuraLink and RG (Route Guidance) or the voice response, the center speaker, the rear speakers, and the subwoofer are muted and you hear the telephone sound and navigation instructions through the front speakers. Muting commands are passed on the GA-Net bus. For more information, see the navigation section. The outline of the audio interruption function is shown in the following table.