New car audio/video install questions

[bodyrocka003]

Ok, so I have decided to install an amp+sub, and headrest screens in my 2013 Maxima. I have a few questions about some products, mostly dealing with power and such. First off I bought a Kinetik KHC1400R to replace my stock battery. From what I gather this should supply enough voltage for my screens, sub+amp, and nav head unit. I also have ordered a grounding+big 3 kit. I will be using a JL Audio HD750/1 amp with a 12W7, and a Carshowelectronics custom dual dvd headrest kit. My main concerns are: 1) will the battery be enough to power said components all at once? 2) will this require a higher amperage alternator, or should I use a cap for the amp? 3) are there any other things I should be considering?

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[bodyrocka003]

Bump!