I got the point about the gains, Thank you! That's what I needed to know.
Unfortunately something must be wrong with my setup, suddenly I'm getting a loud thump from the subs when I turn off the ignition, and a terrible whining noise from all four speakers, I even install ground loop isolators without any luck.
I still don't understand how come this start just by disconnecting the amps to check their specs and the plugged back in and all of the sudden start happening I check all grounds and seem to be ok, maybe I should start replacing my rca cables, I have cheap ones from wal-mart, but I don't know where to get the ones I need. I need the ones with L shape for the plug behind the HU since I don't have enough room behind the dashboard to use the regular ones.
Thank you all for the help, I'll be upgrading part by part in the coming weeks, so I'll be around