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In addition to vehicle manufacturer challenges, if you own an aftermarket stereo that is entry-level or does not have preamp outputs, then you will need to purchase a line output converter (or LOC for short). A LOC will help deliver the proper preamp signal your amp needs as it will convert the high-level output signal from your aftermarket radio to the low-level outputs to the amplifier. There are select amplifiers that have built-in LOCs. However, they tend to be more expensive..
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