Power wire and distribution Question

OK this is what I would do.  I would run the two guage from the battery to your fuse to your Distibution block.  (if you have three 4 guage outputs on the distribution block) use one of the four gauge outputs to go to the caps but before the caps put a 40 or 80 amp fuse and run the caps in parralell and ground them to the chasis.  The reason I would put a fuse in before the caps is because those are like bombs if they get a surge or ground out.  then run your other two outputs to the amps.

Now I noticed you have three amps.  If you have a performance battery such as a yellow top optima or a performance alternator.  You don't really need to use a cap for the amp on your mids and highs.  You could run the 2 gauge from your batter to a fuse then to the distribution block and then one four guage will go to the mid and highs amp and then the other four gauge will go to a fuse then to the caps then off of the caps you can go 8 guage to each of the amps.  You'll have to change the wire between the two caps from 2 gauge to 4 guage.  Hope that helps.  It's a little confusion but write back if you have any other questions 

Honestly, it doesn't matter.  If you're using 2-gauge and 4-gauge, you can put the caps at the battery, at the distribution block, or at the amps.  There won't be any noticeable voltage drop along any of those wires, so electrically, any point will be the same.

Truth be told, caps are really only good for reducing visible dimming and flickering in your lights, so perhaps putting them right next to your headlamps would be best.

Scott Gardner