have a new install running stock HU PDX-F4 and two MRV-500....I'm still breaking them in and havent touched any gains and I'm finding the typical story lights starting to dim with volume at around 30 of 60. Not much thumping in my opinion for them to start going but did have the install profesionally done and would assume grounding and wiring is up to par considering I saw the wire gauge at least. What I didnt consider at the time was a Cap due to all the buzz of power cells vs caps etc. I started researching hi performance alternators and optima batteries. I feel though with just a 4 channel amp pdx-f4 100 rms and two mrv-500 rms amps pushing the subs i wouldnt draw that much current for a 1400 watt system off a new 2014 camry. I guess I am wrong. My first real system upgrade in a real car and I think I still have a ways to go. Any opinions or suggestions will help.