Ive been reading these forums but i still do not have any clear answer , i have a sony head unit but i hear a pionner head unit the other day in some one elses car and it was so clear I mean crytsal clear , so i went to the shop and i looked at my sony headunit and the pionner one as well they both had the same exact outputs , now i don not know so much about this car audio you can call me a noob , but i want that clean sound what can anuone suggest ?

Well there is huge diffrence , thats because the rca outputs have voltage ratings for example , Panasonic has a rating of 1.5V, pionner has a rating 3V , and alpine has 5v rating , there is big difference .