Running 3 amps off the factory head unit

[Ktownmazda6 2]

I drive a 08 mazda 6i sedan, non bose. I have a LOC with 2 pairs of rcas (front/rear). Right now I have a 2-channel amp for the front 2 speakers on the front rcas, and a monoblock for my sub on the back. Well I purchased a 4 channel amp, and 2 bass shakers (one for under eachseat up front). What I was planning on doing, is switching my 2 channel amp for the 4 channel, so all 4 speakers would be on the 4 channel amp, and the 2 channel with the bass shakers. The monoblock will be untouched, if it doesnt need to be. Do I need to just use rca splitters, or could I just run the 4 channel off the front RCA, and use the rca output of the monoblock to feed the 2 channel? Im afraid of running all that on the stock crappy head unit. I am replacing it eventually, but idk when. Help and opinions greatly appreciated.

Thanks,

-Chance

[Kanaworm$ 292]

Does your 4 channel have RCA out jacks. If it does then run that to the mono block.

What kind of LOC do you have?

[Ktownmazda6 2]

My LOC: http://www.pac-audio.com/productDetails.aspx?ProductId=563&CategoryID=28

Unfortunately, no the 4 channel has no RCA out.

[Ktownmazda6 2]

Bump?