there are various kits for amps........depends what size wire you wanna run and what you have planned for the future. typically the thicker the wire, the better the flow. I wouldnt use anything smaller than 8 gauge for a 4 channel and 1/0 for a sub amp.

also you'll need an inline fuse for any amp. they're cheap

maybe 15-20 feet of rca

20 feet of power(use some for a ground)

and various connectors

 

Since kappas are 2 ohm, does this mean that my 4-channel amp will have to be running at 2ohms at each speaker? The stupid questions keep going and going and going and going!
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Yes, the amp will be running at 2 ohms per speaker, that means your 4 channel needs to be 2 ohm stable...