Passive Line Output Converters

Passive line output converters let us connect a factory radio or amplifier's speaker-level signal to an amplifier or processor with RCA line inputs. They suit builds that keep the factory source but need a lower-level signal for aftermarket audio gear. Converter features differ, so match the unit to the signal and wiring job.

Convert speaker-level audio to RCA

A line output converter reduces speaker-level signal to line level. That gives an aftermarket amplifier a usable input when the factory radio has no RCA pre-outs. The Elite Audio LOC35 has level adjustment, while the Elite Audio EA-LOC15 is a two-channel model. Choose the channel count based on the signal channels you need to feed. A two-channel converter can work for a basic stereo input, while a multichannel setup may need more inputs.

Match channels, signal, and control wiring

Do not assume every product called a passive converter has the same power requirements. Some converters need power for added functions. Review the manufacturer’s wiring instructions and supported speaker-level input range, then match those details to the source signal.

• Channels: The EA-LOC75 is a four-channel converter with remote output.
• Level control: Adjustable output helps set the signal going to the next component.
• Trigger wiring: The EA-LOC55 includes a trigger feature. Follow its wiring instructions rather than assuming it connects automatically.
• Input limits: Match the converter’s supported input voltage or power to the radio or amplifier output.

Plan for factory amplifier integration

Factory-amplified systems can use multiple channels, signal processing, or speaker-level outputs that need a vehicle-specific integration approach. Identify the signal source and wiring point before installing a converter. Keep speaker polarity consistent, make secure connections, and follow the product’s grounding requirements. Set the converter output so the downstream amplifier receives a clean signal without distortion. If the factory system needs more than signal conversion, use a dedicated integration interface.

For other ways to connect factory audio, see our active line output converters and car integration gear.