Do I need to upgrade my electrical system to support my car stereo?

[jbanks332002x]

I have a 97 dodge avenger with 2 rockford p2600 amps and 1 rockford 800 watt amp, 2 15'' kicker subs, 2 -6 1/2'' polk audio, 2-- 6x9 polk audio. It sounds good but when I turn up the radio I can hear the sounds cuts down when the bass hits or when I turn on lights or press the brake pedal. What else can I do to fix that problem?