I have a dual xpa4640 600 watt I have 2 10" subs ones a boss 800 watt and a sony xplod 1700 watt and I can't get any sound from them, I used to have a single channel amp and switched to this one when I put another sub in my truck, my amp gets power but the led light is blue and in manual it's says it's supposed to be green my speaker wiring is fine and same with all the others and I have no clue, anyone have ideas ??