No Fuse?

Sebastian you are essentially right, that is one of the things it protects, as an end result. Without a fuse if a positive wire gets "shorted" to ground it basically heats up  (very hot) and melts its coating off and anything else lying on or around it. Basically it is like a welding line at a lesser voltage. Eventually it will either melt the copper wire or continue to melt until the battery is fried possibly damaging other components in the vehicle and giving you that wonderful burnt smell in your car. Now some amplifier companies don't include a fuse on their circuit board (JL Audio for instance) so if not having a fuse with one of these amps the wire is going to burn and short whatever is at both ends.  Amps that do have a fuse will blow the fuse in the amp but will not stopthe wire from burning back to the battery.

As far as Big Purds is concerned, there is no "LAW" that says you HAVE to have a fuse or a circuit breaker, it is a reccomendation of every manufacturer though, and makes for good common sense. Not everyone is privy to have extra computers and electrical components for their car lying around and if you haven't looked there are a lot more companies other than Monster that make fuse holders and circuit breakers. I understand that you choose not to use a fuse at the battery and that's a big risk you are willing to take, but that is just your opinion, just don't ever volunteer to wire up any of my amps.

I'm sorry but your logic is flawed... If the only reason you refuse to install a fuse is because it (looks to small) and are afraid of loosing power or voltage to the amps? Than you are rely uninformed. Especially if you are running such a large gauge wire to the amps. They can only use and draw so much power off the 12-14v electrical system and if a fuse is rated at 100amps than that is the most it can carry, even though your system is only pulling 25 amps through your 300 amp wire.. It is overkill and a market fad to run such wiring to your system. As far as running everything in a good safe place so nothing rubs the jacket and causes a short, that's imposable to grantee. What about a car wreck and the wire is crimped and shorted out sparking that new fuel spill.. I have seen it happen. And for insurance, they have investigators that DO know what to look for. and when they find an aftermarket install of oversized unfused wire directly to the battery they will refuse to pay. You cant destroy your own car and stick out your hand. I have been part of insurance clam investigations and also seen personally the result of a fire caused by such an install. I wont just melt the copper or jacket. The thing will get red hot,, and hot enough in a matter of moments to catch other things on fire. Like melting a hard brake line or fuel line, interior carpeting or other wires they cross. It WILL burn your car to the ground.

I suggest you study oams law figure out exactly what your amps are actually drawing, determine the real wiring size needed, and than think of what you are doing and risking. A 100 amp fuse will not restrict voltage or reduce the amount of power you system can draw.

GOOD LUCK...