Hello, new to forum. upgrading 2012 ford fusion system

[GJG1964]

I have stock head unit: rear channel running fosgate 3 ways in rear doors. Front channel connected to lc2i line out converter. 1 channel of LOC thru bass boost control knob to amp and 2 10" subs. 2nd channel of LOC connected to fosgate r150x2 amp running fosgate 3 ways in front doors. I want to add a pair of fosgate 3 ways to rear deck. Question: should I run preamp out thru 1st r150x2 to another R150x2 or is there a fosgate amp that will run all 4 speakers? Front door speakers are p1683 and rear deck speakers will be fosgate rx693. Thanks!!!

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