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Message: <blockquote data-quote="spinelli" data-source="post: 3269404" data-attributes="member: 577278">Most stock head units have built in amplifiers or there is a proprietary amp connected by a wiring harness.  That's why you won't see any stock HUs with RCA outputs (but it would be a nice option if you have an integrated dash and need to stay stock).You do not have to get a new headunit in order to put a system together.  Commonly, people use LOCs (line out converters) to convert the headunit's high level output (from the stock speaker cables) to RCA output (to connect to an amp).I'm not completely sure what you mean on the last part, but if your amp is a two channel or for subs, then one pair of your RCA plugins is the input and the other pair is an output that emits that same signal.  This extra RCA output lets you daisy-chain multiple amps together using the same input signal.</blockquote>

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