Well, two things stand out. 1) turning up the dial, turns down the volume. 2) its lowering the sub level on a a completely different amp. Once the audio signal leaves the head unit, on their own RCA, there is nothing in common between the two.
Are you using three 2 chnl RCAs or single 6 chnl or a 2 and a 4 chnl RCA? The issue lies in the RCAs
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