Audiophile

TL;DR How can I equalize my car speakers using an equalizer app like ViPER4Android on my phone?

I just equalized my headphones on my phone using ViPER4Android's convolver feature and a headphone-specific .wav file I got from AutoEq, and it sounds great. Unfortunately, AutoEQ only seems to support a limited range of sound devices, which does not include car sound systems.

I'm not an audiophile, but even I can tell that my car's system's frequency response is terrible, specifically in the low end, where there are specific frequencies that resonate through the car (especially noticeable when the bass frequency changes in a song).

As far as I know, AutoEq's files are made by playing something over the speakers, recording it with a high quality microphone and correcting it to match some pre-determined frequency response curve called an equalizer target. I was wondering if there's a way to replicate this process using my phone's microphone (I'm not after near-perfect sound quality here, just something that sounds reasonable), and if that would be the best way of going about this.