Speaker Sound System Interface

The speakers receive information from the radio in the form of electrical current through the speaker wires. The electrical current produces the electromagnetic forces which cause the speaker cone to move, which in turn creates acoustical energy. The acoustical energy radiates from the speakers and is received by the operator as sound. If the speaker wires occasionally become shorted-to-ground or to vehicle power, the radio will sense these conditions and shut down in a non-destructive manner. After the short condition is removed. Normal radio operation will return.

The speakers are angled upward and rearward for optimal sound performance. They are mounted to a flat door inner surface and provide a splash proof housing and seal through the use of a gasket on the speaker basket flange that meets the door inner sheet metal. The speakers are closed out to the trim from the front. The supporting structure is rigid as to not allow unwanted resonance or loss in bass frequencies. Grilles are used to protect the speaker covering since they allow the speaker the freedom to move and breath to make the performance more predictable. The minimum speaker impedance per channel is four ohms and the interface to the speakers is through 18 gage wire (for up-level audio sound system only) or 16 gage (for advanced audio sound subwoofer only) through the body harness. The speakers are mounted low and forward in each of the four doors.

Up-Level Audio Sound Speaker System
The up-level audio sound system consists of eight speakers. In each of the four doors, there is both a 0.75 in. tweeter and a woofer (6 in. HSS in the front doors and 5 in. HSS in the rear doors).

Advanced Audio Sound Speaker System
The advanced audio sound system consists of seven speakers and an amplifier. There is a 0.75 in. tweeter in each of the front doors, a woofer in all four doors (6 in. ERS speaker in each front door and 5 in. ERS speaker in each rear door), and a 5 in. subwoofer (located on the rear shelf panel for the sedan. In the wagon, the subwoofer is mounted to the left side wheelhouse area). The amplifier module is found attached to the I/P beam. The supporting structures are rigid as to not allow unwanted resonance or loss in bass frequencies for both the subwoofers and the amplifier.

The amplifier contains all of the necessary signal processing and power amplifier circuitry that is not contained within the radio and has dedicated battery circuits, a battery fuse, and ground circuits for its power source. The wiring from the radio outputs to the amplifier inputs consist of a harness containing four twisted pairs, one for each audio channel. The radio also supplies a switched battery control signal to the amplifier for the purpose of controlling the module's ON/OFF modes. The speaker outputs are not grounded, but are protected against accidental grounding or connecting to battery.