Anyone know if you have a MX with subwoofer on the car does the Amplifier for the subwoofer on the back by the subwoofer box or on the front of the car? Also if I tap to the subwoofer amp input will it be line input. What is the color wires of this line input to the subwoofer amp? I am getting external additional subwoofer and amplifier to hook to the car stereo system. I just need more bass. My questions is do I need to get a speaker input converter to line input for the subwoofer amp or I can just tap directly to the M3 subwoofer line input? I anyone have this done please share with me.