Ice wrote:For example, if you amp has 2x30amp fuses, I would fuse the power cable at approx 40/50 amps, if you add another of the same amp I would use an 80 amp fuse.
Now this is wrong... voltage drops the longer and thicker is the cable. Rather use 5-10A bigger fuse or the same the amp has. Never smaller.
Little help ->
http://www.dc-ice.ee/pics/power.jpg
it's up to you, but I would always use slightly smaller, as if a problem occurs, I don't want my power wire between the battery and the amp melting and maybe causing a fire. I would much rather the fuse under the bonnet pop now and again than the doing any damage to the amp or causing a fire.
you need to remember current and voltage are totally different things, my current amp can pull up to 180amps of current, but will the voltage will still be between 12-13.4 volts.
if decent components are used, voltage drop between battery and amplifiers should be minimal, in my last car voltage drop was only 0.2 volts.
