I beg to differ. I tried running my setup with and without the amp and right now I am still using the factory amp.........sounds pretty good. Here is what I did. I turned the "Loud" setting off on my deck (kenwood mpv-619), I set the "V-Off" to about -2 or -3. Plus, I am running bass blockers on both the front and rear set of speakers. I think you get better sound this way (better bass too).
