so worst case scenario is that it will blow the fuse, right? my car won't burn down if i have too big of a fuse going to the engine bay or whatever, right?
if your fuse is to small then you will not let enough current through as what it wants to draw and they will blow fast. if your fuse is to big, you could let to much through and either blow the fuses on the amp or maybe even damage the amp. the whole point of having a fuse by your battery is to prevent any current problem as quick as you can, thats why you should have a properly sized fuse.