ok my friend has a sony 1000 watt amp as well and its really picky... sometimes its doesn't work either but then we figured out you have to make sure ( even if you have all your wires super tight and great connection etc etc) that you have the right wires. Some wires will only take so much... you have to get smaller Guage wires the more watts you run... if you have a skinnier wire(higher gauge) then the wire will heat up and could melt or stop working and could possibly be unsafe were ever you ahve it run throughout your car.... i have about 3000 watts in my car and my power wire is a 4 gauge wire and my speaker wire is 10 gauge so very thick wire but you need that bigger wire to contain all that power...I know this from experience with burnt wires and systems not working for my friends.... Now all my friends go to me to hook up there audio systems haha....i might open up a shop