Ok so i have 2 atlas runnin of a PG 600.1 underpowering each sub by 50 watts...ik wondering its freakin hard to find a good 700 watt amp mono that ca put out 70p0 watts at 1-4 ohms...would i just be better off gettin 2 400 watt mono amps???And also with amps puttin off 400 watts will i need a fan to cool em...bcuz my 600 came built in w 1...im wondering if i should look for some 400 w amps that do to? Input would be great thanks guys