Wiring My Audio System Fuses

Right let start from the beginning,

i have a 400w amp that powers a 900w sub so thats fine

ill be getting 4 x 450w 6x9's
and a 1200w amp

now for the technical bit "keep up im struggling"

ill be running a #4 gauge cable from the battery with a inline 150amp fuse to a "power block"(fused distribution block)
then inside the block ill have 100amp fuses as ill be running 2 x #8 gauge cable to the amps,
so if im correct that all this is positive and from what i have read i may need a capacitor to help the sub when my audio is in full swing

so in other words itll look like this



now going on Spences setup is my battery going to cope but i dont mind leaving my engine running if this is the case

looking around i think im gunna need a custom wiring kit aswell as the normal wiring kit that ill need to hook everything up

thinking about it im going to be running an 8 gauge and 2 10s, so who knows of somwwhere to buy desent 8 gauge cable from

yer thinking that its something completely new to me so i was just about to delete my post lol gunna stick to the old plan just need some more cable as the 1200w cable pack dosent come with the right gauge cabling so will have to up the wiring kit to a 1800w kit for the 8 gauge cable

yer im looking at a 1.2 farad by juice it not to pricy and will look nice and prove a purpose, unless i run the main power cable throught it as the hole setup is nearly 2000w with both amps, its little things i get confused on being as i dont know much about how it should all work together, im thinking the power cap for the sub as the 1200w amp will be rapping my battery and the sub when used heavly may cause a volt drop

** edit im running the 400 amp on the 900 sub now my EDGE setup **
[url:1qrak2ku]http://www.edgecaraudio.co.uk/enclosures.php[/url:1qrak2ku]

sorry 300w RMS 900 Peak but amp wouldnt handle that

the bottem one 12"

so im running a 800w setup and will only be needing the downrated power cable the #8 gauge from the battery and the #10 gauge and downrate the fuses but am i still gunna need the cap as i wont be uprating mt battery like spence has but he is running alot more
and would a 1200w amp run 4 lots of 450w 6x9's ok

ie 600w amp running 4 200w speakers

do not replace 4gauge with 8 or 10 it would be the most stupid thing ive ever heard!!

oh and be carefull with "450" 6x9's you will blow them runnin any where near that power through them!!