Do Line Out Converters Need Power? Demystifying Audio Conversion

Q: How does a line output converter (LOC) work?

A: A line output converter, often abbreviated as LOC, is a vital component in car audio systems that facilitates the integration of aftermarket amplifiers and speakers with factory car radios. This device operates by converting a speaker-level output signal, which is typically produced by a factory car radio, into an RCA preamp-level signal. The primary purpose of this conversion is to bridge the gap between the output voltage levels of the radio and the amplifier, ensuring compatibility between the two.

In practical terms, when a car radio sends an audio signal to its built-in speakers, it does so at a speaker-level voltage, which is relatively high and designed to power the car’s internal speakers directly. However, when upgrading the audio system and adding an external amplifier, it’s essential to provide the amplifier with a lower-level RCA signal. This is where the line output converter comes into play.

The line output converter takes the high-powered speaker-level signal from the radio and transforms it into a lower-voltage RCA signal that the amplifier can accept and amplify further. This process enables you to achieve improved sound quality and control by using an external amplifier and speakers. Additionally, a line output converter can be valuable when connecting a new aftermarket radio to a car’s factory amplifier, ensuring seamless compatibility between different audio components in your vehicle’s audio system.

Is grounding necessary for a line output converter (LOC)? Yes, it is essential for the proper functioning of certain advanced LOC models. These advanced LOCs can not only convert input signals but also detect them and generate a remote output to activate aftermarket amplifiers or other devices. To enable this feature, the LOC needs to be connected to both a 12V+ power source and a ground connection. The 12V+ power source supplies the necessary current to power the turn-on circuitry, allowing the LOC to create a dependable remote signal for activating external equipment. This grounding requirement ensures the LOC functions reliably and provides a seamless integration of aftermarket components. The information provided here is accurate as of September 24, 2019.