Roswell dualzone controler. Advices please
 

Hey guys.
My weekend project is to plug my new roswell dualzone controler. Sadly i have no plan in the box and im a little bit confused with the wiring.. i just want some little advices to save me hours by myself haha if someone know this product!
I have a 2016 tige RZR with WetSound SYN2 and SYN6 amp.
i want to put the dual zone on channel 1to 4 on the syn6 and on the syn2.
So just a little review of what i need to unplug and replug would be appreciated!
The roswell knob have 3 pair of female rca (input, zone1 and zone2 output).

The only thing im worried about is to have the correct RCA wires because i have to run approx. 8ft. Between them.
My storage is deep in the woods so i want to buy the cables here in the city and i wish to be able to plug all that with no need to make 2hours driving for a missing or wrong wire haha.
Thanks alot guys.