Audio Systems: Amp blowing fuses, exact model, playing music

Question
My 600 watt kenwood amp has started blowing fuses all the sudden, can you give me some info on how to fix please.  

Answer
well tell me when its blowing fuses.  in other words,
examples:

you have the car off/not playing music, you put in a new fuse and it blows as soon as you connect it.

or

it plays fine until you turn it up real loud, then it blows

or

it plays fine for 10 minutes and then all of a sudden blows without changing the volume setting at all.

stuff like that will help me to know why it's blowing.

if you could let me know the exact model of the amp, and your subs, how many subs and the way you have them wired that will all help.

thanks!