Install question

I’m trying to install a single 12” woofer with an amp in a 08 Ford Focus .

He is using the factory radio right now and also bought a line out converter .

I tapped into the rear door speakers and hooked everything up and it’s the worst thing I’ve ever heard it’s not loud at all and sounds distorted .

I hooked up the same 12 and amp in my truck and it sounds amazing .


Here are pics of the wiring for an 08 focus . Did i do something wrong by splicing into the wires at the rear doors?

Or if I hook up the wires accordingly is there such a thing as 1 input being out of phase on the line out converter ?
 

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He has 2 amps both older mtx amps .

I think the first one was something like a 4122 without going out to his car to double check .

And the other mtx amp is a Thunder 2160

It won’t cost him anything since he already has the amps .

The only reason the smaller one was installed at first is because the bigger amp had no output I found a couple resistors and a Mpsa06 to be defective
 
I redid the wiring to the pack box tapping into the front door speakers as the signal source . I also put the bigger amp in the car and it’s a night and day difference .

It actually sounds pretty good . I told him that he could get a bigger amp at some point but he would need to add another amp to his door speakers first and change them out since the factory head unit doesn’t have eq settings to adjust the factory speakers they will distort trying to keep up with the bass .