K i already have 2 12s and a 350 watt amp in my car and im bout to hook up an amp to my speakers. so i bought a distribotor box and im not quite which size fuse to use. My friend is giving me one of those cheap sony 400 watt amps so should i use a 30 amp fuse or a 60?

 

Are you talking about the main fuse near the battery, or the fuse in the distribution block?

 

the fuse in the distribution block. i already have one near the battery. i just dont know what size to use in the block.

 

Use the one that's closest in value to the fuse in the amp itself.