aside form your post making no real sense at all..
you did not have a power surge.. if your fuse did not not blow its likely you were drawing less then 80 amps of current..
but its more likey your wiring it badly installed .. is your ground to a clean bare metal point? and tighten down fully? as this can cause arcing and create higher resistance thus need more current to provide same power ..
its also possible to have the cable melt if your wire is too thin and not true AWG..
the main fuse is there to protect the cable , true 4awg is safe to 100~150amps (length dependent).. then from your distribution block you should fit a fuse as close to the amp rating and a cable thick enough to handle the current it needs.
having a smaller/bigger fuse wont make a difference to how loud it is (yes i know you need to draw more current to produce more power)
having a ported sub and a non ported sub is pointless either have them both ported or sealed , or just run one or the other...
your sub is only around 500w rms , 1600w is its peak rating which mean nothing and is just a marketing figure.. which should be ignored..
If you dont know the basics of electronics then your should leave it to someone who knows what there doing to stop things like this happening (cars burning down)
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