I have the Power T1572's, they're in the higher end series of RF's. The Prime is their lower end, then the Punch and then Power. I think the MSRP was somewhere around $200+ when they were new, I picked up all 4 for $90 so it was a pretty great deal. I bypassed the stock amp's so they're running off my Pioneer HU and it seems to be enough power, then I have a JL 10" and they all sound good together. I'm definitely happy with them especially for the price I got them for. As far as an amp install, I've never felt the need to run another amp for the speakers as long as you have a good HU that puts out enough power. I only run an amp for a smaller sub because I don't listen to much rap or other really bass heavy music and I just want the sound to be full, not rattle windows. I never wanted to put that much money into a system for my car, I prefer to use it for my home stereo instead. Thats just my opinion though