hi, i have the amplifiers one 4800 watt and two 1800 watt ones. i need a way to hook up[ these three amplifiers even on the 4800 watt one i cant have all channels going at once. i am not using them in a car at the moment im running them in my house from an mp3 player using a headphone to phono cable but on the 4800 watt amp there are four input connetors (two phono's). i am powering them using a booster pack to jump start cars but this is not powerful enough to run all of them onlt to rn the 1800 watt ones. please let me know what i need to run all of them together and any cheap ac to dc power supply that is 12 v with huge ampage. Regards, Donncha Kearney