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So, we can run a dual sub box by putting the left and right sub wires into a 2ch amp?

 

why in the world would they run FOUR black wires to left and right front speakers....
...and four leads to the subwoofer....

 

Someone know what is the conector type that is connected to the sony amp that goes to the speaker.

I want to find the female side of this connector for my install

 

I know this isn't exactly what you asked for but if you want to extend the factory sub wire loom branch by purchasing the correct mating connector and then run 4 new wires from that purchased connector to a powered sub (making your own wire harness)...

It's Molex
http://www.molex.com/pdm_docs/sd/334826201_sd.pdf
http://www.molex.com/pdm_docs/sd/334721201_sd.pdf
https://www.waytekwire.com/item/38406/4-Circuit-Dual-Row-2X2-MX150/?gclid=CPOx44ed9dECFdgDgQodK64Dyg

For a few dollars this allows you to make your own personalized wire harness loom that plugs into the factory loom. Obviously, this is for those who either don't want to solder, etc or who want to be able to reinstall the factory stuff quickly.

 

So I have TWO individual 100-Watt Kicker-Powered 8" Sub-enclosure(s) that I'm installing.

In the install instructions there are no RCA connectors, the Kicker wire-harness is using "hi-level" left AND right stereo-speaker channel inputs [(+) & (-)].
MEANING, EACH harness has two green wires [(+) & (-)] and two grey wires [(+) & (-)]
So Kicker-powered sub is receiving a signal-input from two-channels, ie- left and right, to get a full "stereo" sub signal, right?

Guessing here: SO each OEM "pair" of subwoofer wires are considered a "single" channel, right?
Channel-1 > VT (+) and YE (-)
Channel-2 > GN-VT (+) and GY (-)

So in-a-nutshell, meaning I have to go with two Y-connector [(+) and (-)] to split out from EACH OE/Factory single-channel wiring to create 4-channel wiring?
From single VT (+) wire to TWO wires \\ Harness #1
From single YE (-) wire to TWO wires // Harness #1
------------------------------
From single GN-VT (+) wire to TWO wires \\ Harness #2
From single GY (-) wire to TWO wires \\ Harness #2
------------------------------

That's my take on how to use the sub "high" level inputs from the OE harness; and yes, I ordered a molex 4-pin 3.5mm connector with pins to make this "plug-n-play" wiring.