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FiX™ 86: OEM Input Connections

Designed to retain OEM fader functionality, the FiX™ 86 accepts full-range or band-limited factory outputs (up to 3-way front + 2-way rear) from an OEM audio source (250 mV – 30 V RMS). Engineered to combat induced cable noise, the input architecture is set up in a differential-balanced configuration, making these inputs compatible with virtually any analog audio signal. Connections are made via four plugs located on the side of the unit labeled “OEM Analog Inputs”. Each 4-pin plug accepts two channels of audio input, separated in pairs (Left and Right).

Depending on the specific architecture of your OEM system, you will need to locate suitable connection points to provide appropriate input signals to the FiX™ 86, while maintaining OEM fader functionality. It is recommended to obtain a service manual for the vehicle you are working on to locate and identify the correct OEM wires. Refer to the table below when making connections with your OEM audio source.

Note: With most factory audio systems, it is not necessary to connect all eight input channels of the FiX™ 86. We recommend using the least amount of inputs needed to create a full-range audio signal, while retaining your fader’s functionality.

JL Audio FiX *6 Inputs

It is vital to observe the correct electrical polarity of each channel’s input signal. Failure to do so can result in improper calibration, loss of signal and poor performance.

Some factory audio amplifiers employ a load detection circuit that looks for a low-impedance load (expecting a speaker) in order to enable audio output. When a high-impedance load like the input section of the FiX™ 86 is connected to these factory amplifiers, the audio outputs will mute.

After installing the FiX™ 86 and turning on the audio system, if there is no output from the factory amplifier, a FiX-LSA-4 Load-Sensing Adaptor (sold separately) will need to be inserted inline with the FiX™ 86’s inputs. The FiX-LSA-4 presents a safe and appropriate load to the factory amplifier and corrects the muting behavior. Learn more about the FiX-LSA-4 and when to use it.

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