Sorry if this is dumb but I am getting ready to ditch the entire Mach 460 system and need some advise. I have a JVC head unit that is like 45w x4 max power and a 4 channel Kenwood amp that is like 35w x4 rms. My question is when I wire my 4 new speakers should I just run power from the amp or should I use the amp + the head units power. Basically should I just let the head units power do nothing? I will be using 2 Infinity Kappa 5x7 and 2 Cerwin Vega 5x7. I hope that I did not wreck the Cerwin Vegas as I installed them for a short time with the stock system before I knew the ohms were way off witht the 460. What is a good way to check and see if they are ok?