fosgate 800 a4 wiring

Oh dude, you have a real bad match of subs to amp. Your amp is rated as follows

100w rms x 4 into 4 ohms

400w rms x 2 into 4 ohms

200w rms x 4 into 2 ohm

anything  x 2 into 2 ohms = not going to happen and you buying a new amp.

anything x 2 into 1 ohms = not going to happen and you buying a new amp.

There is only one safe way to hook up your subs to this amp. Here it is.

Wiring Option #2

Use channels 1 and 2 to drive front speakers and use channels 3 and 4 in bridged mode to drive the subs until a more suitable sub amp can be found. Keep this amp to power up the front and rear speakers later on.