Amp keeps blowing fuses?

I am running a Kicker KX350.4. Each channel is running at 4ohm stereo, so it is well with-in its operating ranges. I am currently running 2 ga from the battery to a dist block. There is a 150a inline at the battery, and a 30a at the dist block. I took out the class d so all I have running is the Kicker. It keeps blowing both internal 20a fuses, but neither of the inline fuses are blowing. Is this an issue with the amp, or with the wiring?