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<blockquote data-quote="jrwalte" data-source="post: 4607386" data-attributes="member: 584454">That depends on your HU.&nbsp; Most likely the two RCAs are for front and rear and your HU doesn&#039;t have a dedicated sub out.&nbsp; You should take it out (or look at the manual) and determine if it has 4 RCA OUTs or 6.If your HU has 4 RCA outs, this means you should take the front or rear RCAs from the 4-channel RCA line you run (doesn&#039;t matter which) and connect it to the RCA IN of your 500/1 amp.&nbsp; (the other 2 RCAs from the 4-channel will go directly to the 300/4 amp). Then purchase a short 2-channel RCA cable to go from the RCA OUT of your 500/1 amp to the RCA IN of your 300/4. FYI, your 300/4 amp doesn&#039;t have a RCA OUT option, that&#039;s why you have to go to the 500/1 first.This is assuming you are running all 4 channels of your 300/1 and not bridging it to 2 channel.If your HU actually has 6 RCA OUTs then you will run 3 sets of RCA cables and not 2. One set for front, rear, and sub.</blockquote>

[QUOTE="jrwalte, post: 4607386, member: 584454"] That depends on your HU. Most likely the two RCAs are for front and rear and your HU doesn't have a dedicated sub out. You should take it out (or look at the manual) and determine if it has 4 RCA OUTs or 6. If your HU has 4 RCA outs, this means you should take the front or rear RCAs from the 4-channel RCA line you run (doesn't matter which) and connect it to the RCA IN of your 500/1 amp. (the other 2 RCAs from the 4-channel will go directly to the 300/4 amp). Then purchase a short 2-channel RCA cable to go from the RCA OUT of your 500/1 amp to the RCA IN of your 300/4. FYI, your 300/4 amp doesn't have a RCA OUT option, that's why you have to go to the 500/1 first. This is assuming you are running all 4 channels of your 300/1 and not bridging it to 2 channel. If your HU actually has 6 RCA OUTs then you will run 3 sets of RCA cables and not 2. One set for front, rear, and sub. [/QUOTE]

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