I had this unit, the DDC, and the LC8 in my Chysler 300C connected to the FACTORY head unit with 2 12's, a D-series amp, a 4 Channel Amp, and a Cap. This EQ gives you so much control over your sound system that it's ridiculous. My car sounded like a Symphony Orchestra from outside with the doors and windows open...LOL!! It was just so clean and loud without distortion. If you want the cleanest sound at high volume don't even look at another setup. Pay the money for those three pieces and take home some trophies.....hands down, the hottest on the street!