Is the 2nd set of RCAs that is going to the sub a fullrange, or a sub-only set? Some of these amps have an RCA out, so you could run both sets into the 4-channel amp, maintain both stereo AND F/R fade from the deck, and run the RCA outputs from the 4-channel amp into the sub amp. That's a possibility.
If not, you could use 2-channel RCAs into the 4-channel to run all sets of speakers.
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