Having A Wiring Issue

[cannaert]

Ok I have been Helping a friend put a sub in his new car ( Matrix ) He is keeping the stock stereo for now. The amp he is using is a Legacy 470. I have a inline converter hooked up and all the wires hooked up the RIGHT way. I thriple checked every thing. I am running 8 gauge wire to with a 40 amp fuse at the batt.
Ok here is what's going on when i hook up the battery i keep blowing the fuse at the amp. I getting a bit confused as why i am blowing every fuse i put in the amp. When it is all wired up the right way.

[auchevyalero2004]

that usually happens when you have the power and ground reversed on the amp. otherwise i'd guess a bad amp. afterall it IS a legacy...

[cannaert]

Yea its my old amp work fine when i took it out of the car last summer.
That what i thought it was at frist i put the ground on the power and the power to ground check it was right, I redid it any ways and still doing to I my tell hiim to get a nother AMp