Originally Posted by 2002BamaKR
I wanted to try and run my four door speakers off of one channel if possible
You don't want to do that. That would divide the power of the 1 channel by 4. Plus you wouldn't have stereo sound but 4 way mono. That would mean when a instrument plays on the left channel you won't hear it cause it would be going to your sub. So all 4 speakers need a individual channel to sound right.
Take that capacitor and put it back in the box. They are pretty much a waste of money on most basic systems.
here's a lengthy answer to the "Why?" lingering in your mind:
So with that amp here's what I recommend. Get a descent set of front door speakers and use that rockford amp solely to run them. Get 1 more amp either a cheap monoblock or 2 channel amp that puts out 300w RMS. This amp needs to have a built in crossover for subs other wise known as a low pass filter. I can find one on ebay if you want. I don't want to go on further with explaining this as I don't know your headunit. Sooo....
Before you start digging in we need to know if your using your factory system or aftermarket. Also what sort of budget do you have for door speakers and another amp? We can help you out here just don't leap before you let us look.