AMP Wiring Question

[x5turtle]

I just laid it down and simple, setting up a subwoofer amp in a X is as easy as snap due to the batter is in the trunk~ but~ one big problem for me is that~ I don' t know where to hook up the amp control~ and the stereo input, I don't want to go the route of tapping into the speakers to get the source~ please advise~

[DecimusMaximus7]

Hey on my 330 I tapped into the wires going out of the factory amp to the subs with a line level converter (I'm pretty sure that is what it is called), but other than an aftermarket head unit, I don't think there is any other way to get the signal. I have never had an amp control. I just set the amp where I like it and use the head units bass controls to go up or down as I need it.