The DQ-61 is a fantastic option when adding a full audio system, to a factory radio. Its a 6 channel active line output converter, with MUCH more! It has a line driver, to get your amplifiers a fantastic, strong signal. It has a "bass knob". It has a 7 band equalizer for each zone (front, rear and sub) it has Accubass, and even time correction!
With one of these, we can dial in your system to sound exactly how you want