I have some questions about how i can upgrade the stereo in my car. I have a jeep cherokee. My dad gave it to me and he added some speakers and a head unit. He put two full range speakers which are 4 ohms each and handle 125 watts. He also added a pioneer head unit which is 30x4 watts. The system gets loud enough for my needs but distorts at louder volumes. I wanted to add an amplifier to make the sound clearer at louder volumes. If i buy an amp, what limit do i have to what i can get? I would assume I should check the wattage rating at 2 ohms since i have 2 4 ohm speakers correct? Also, can i use the amp to power the new speakers and use the head unit to power the front speakers of the car? I was thinking of buying an amp like this Im sorry if this doesint make much sense. As you can tell, i dont have much experience with car audio as you can probably tell.