at least 4ga wire but it would be best to get 4awg or 0awg. 4 gauge is smaller than 4 American gauge wire
crutchfield has a wiring diagram for all kinds of configurations, check it out.
you need an amp and an amp wiring kit
do amps get pushed? Normally a 1200 watt amp would need driving with less than 12 watts of audio.
You should use 14 AWG wiring on all 15 amp circuits.
1200 Watt wiring is more than enough for an 800 Watt amp. The rating of the sub doesn't make any difference to the cables. If you want to use the sub to its rated power you should get a bigger amp. If the amp can only give out 800 Watts and the sub can take 1100 Watts then you can put a bigger amp on. It is still going to be loud as with an 800 Watt amp. I have a 300 watt amp with a 1200 Watt sub and people hear me coming.
a 400 watt 2 channel amp should do fine. all you need to do is bridge the sub when it is being hooked up
First you will absolutely need an amp to power any subwoofers. Nowadays subwoofers come along with amp..& normally one 1200watt subwoofer decrease your car battery lifetime to 2-4 month
you just need one, a general rule of thumb is that the wattage on your amp should be double the wattegae on your sub, hence if you have a 1200 watt sub you'll need a 2400 watt amp
When buying an amp its best and safe to use the 1:1 ratio. That would mean if subs RMS was rated at 350 watts then get a 350 watt amp. Alot of installers will use 3:1 ratio because the subs max rated at 1200 watts so they say you will need a 1200 watt amp. But the truth is that sub may only peak a fraction of a millisecond. So unless your competing for a title championship there is no need to destroy you subs that you paid so much for.
You need to instal the same size and amp rating as you removed.You need to instal the same size and amp rating as you removed.
You should use a 4 guage wire. There is a handy chart located at http://www.the12volt.com/info/recwirsz.asp which lists the proper wire size for differing wattages.
NEC states that all GFCI's require a 20 amp circuit, the wire size for a 20 amp circuit is 12 gauge.