My tips for tuning your car audio system:

1) Eliminate the Sub/Amp from the equation, you can do this by either disconnecting the amp or (what i recommend) turn the gain on the amp all the way down...don't worry, we'll connect it back again.

2) Turn your front/rear speakers to a moderate level

3) Use whatever DSP your head unit (or if you are using an OB processor, now would be the time to engage and adjust that) has and set the EQ to your personal preferance

4) Turn the front/rear speakers to as loud as they will go without distorting.

5) (It helps to have a friend do this while you listen to the system from the driver's seat) SLOWLY turn up the gain on the Sub amp until the bass from your Subs fills out the sound of your system.

6) Check that the sound quality is satisfactory over the entire range of your system, soft to loud. You're done!

**I suggest setting up the system so that the overall output is shaped like a pyramid...that is to say there are more lows than mids, more mids than highs...but that's my personal preferance. It's your car, so in the end it's up to you!**