Ok well if you have only spent like 85 bucks on rear speakers and like 200 on front or something

then aim lower for RCA etc....so $1000 system should spend $100 -150 on all cabling Power RCA Speaker

Yes EK9 is right

RCA give Audio signal from Head unit to Amp
In you case Front speaker and Sub woofer you need two RCA's for the two channel your running

What type of amp etc and stuff you running ????

but dont go to cheap like $ 5 just sound bad maybe even $20 if there are any check jaycar etc...

75 dollar power cables look good then just get cheaper RCA $69 maybe not in your case


Good luck