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Easily add an aftermarket amplifier to your vehicle’s factory audio system with the LocPRO Advanced 4-Channel Active Line Output Converter with Auto Turn-On by PAC. The LPA-2.4 converts speaker-level (high-level) audio signals to RCA preamp (low-level) signals so you can install an aftermarket amplifier without replacing your factory radio. This four-channel active line output converter can also be used to retain your vehicle’s OEM amplified audio system when replacing your factory radio.