from the battery i have 4 ga. power wire, with a 100 amp inline fuse, running to the dist. block. from there i have 8 ga. running to power the amp, and a small wire running to the crossover. i have a 8 ga. ground on the amp running about a foot away grounded to the frame. i grinded the paint off well. for the crossover ground i have a wire of the same gauge as its power grounded the same way as the amps ground. the amp has 2 30 amp fuses and i turned the key on and 'pop' they both went kapoot. went to my inlaws and got 2 more from my father in law. double checked everything that i could think of and put 2 more in, turned the key, 'pop' again. the crossover is fine and still getting power its just the 2 in the amp that keep blowing. anyone know what to check?