Using Dist Block And Connecting Subs

[michaelking 10+ year member]

Okay, I'm about to purchase a enclosure with two 12 inch kickers that are rated at 400 watts a piece (And have been wired down to 2 ohms with one 2 ohm speaker output) and an MTX amp which is rated at 800x1 @ 2 ohms. I also have 4 gauge wire fused at 100 amps running from battery to an unfused dist block. Here is a link to the sub and amp:

(Amp)

http://www.crutchfield.com/p_236TC8001/MTX-TC8001.html?tp=115

(Sub)

http://www.crutchfield.com/p_2067DCVR12/Kicker-07DCVR122.html?search=CVR122

What I'm having trouble figuring out is, the gauge of wire to run to each amp. Crutchfield says I can run 4 gauge to the mtx and 8 gauge to my Profile AP1040 AMP. Today I was told that I Could use my existing dist block to run one 8 gauge wire to the AP1040 and a 4 gauge wire to my MTX. Confused because I always thought that when running 4 gauge wire to a dist block, you must branch it off into 8 gauge wire.

The profile AP1040 has two 30 amp fuses and the mtx has three 30 amp fuses, so what do I need to do at the inline fuse, which already has an 100 amp fuse attached, should I keep that or do I need to upgrade to a larger fuse?

One last question, if you look at the mtx amp you will see that it has a speaker one and speaker two input, how would I go about connecting my 2 ohm kicker sub to the amp (The sub only has one speaker terminal at 2 ohms?)

Any help would be appreciated,

Mike

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[GAM3OVR 5,000+ posts]

go bigga on ur wirezzzz

 

[GreenBook 10+ year member]

What wiring you can run out of a dist block depends on the block. Does it have adapter fittings to run different size wire? An un-fused block can in most cases can handle more power then the actual input-wire is designed to handle.

But really, you run of 4 gauge from the battery isn't properly sufficient. You need a wire that can handle the total power load of both amps; and the main line fuse should be a 140 or 150, to reflect the maximum aount of draw it might see. I don't think 4g can handle that without risk of overheating/melting.

If you don't like to crank the volume much you might get away with it, but you might end up popping that 100amp fuse at some point.