From: amp wiring

[KU40 173]

Oh boy, where to begin. 1/2" enclosures are not the best. Having two different sized enclosures is pretty ghetto and not ideal for sound reproduction at all.

How do you have the subs wired to the amp? Since those subs are 4 ohm SVC, however you have it wired to that 2 channel amp is not ideal. Does this setup sound good at all?

You need a fuse about a foot from the battery under the hood if you don't have one already.