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Most 4 channel amps will have 4 (rca)ch inputs, therefore using all 4 rca runs from a LOC. It will retain fading and balance controls accurately.
Now if using a 2 ch amp or amp with 2 ch inputs then 4 ch LOC would not needed or use all 4 rca's.
Depends on setup, maybe 4 ch amp with 2 for mid/high and other 2 for sub, then fade controls would be lost.
If you're only adding amp for sub, and powering doors with HU, then the LOC's that are pictured provide "pass-thru" for that setup as well.
In my case, I'm using 6 ch amp, 4 ch for mid/high, 2(bridged) for sub. The fade control on radio is used by the amp the blend levels between sub and door speakers.
Using factory wiring back to door speakers is easiest, but not as optimum as using quality speaker wire. I don't worry about it because I'm using stock HU. If I wanted better quality sound, I'd start with new HU first.
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