I will tell you the story of my system which i just finished a couple of weeks ago. I took the car to a good car stereo place to see if he could tune my dsp. This guy Mike says he has 25 years exp, so im like ok. Im more of a home audio guy myself, now getting into car audio.
He listens to my system, flac files and tells me you have no bass and no mids. So he tells me im not sure i could tune your system to sound as good as you want it to. He thinks the head unit has a cheap Dac in it, tells me to hook up my LG V60 which has a good quad Dac.
So i run 3.5mm to rca males and plug directly into the amp, taking out all sound from head unit. Now it did sound better, not much, but some, so he may be right the Dac is not quality.
He told me to get a seperate DSP of high quality and go from there and add a sub. Also he said to put my tweeters into pods so they face me instead of bouncing off the dash and windshield.
This is where i am now, i have had trouble tunning the dsp in head unit cause i have 0 exp doing it. This is why im on here wondering where to go from this point, im guessing try to tune the dsp and go from there ?.
I will mess with the hpf and set that and turn down the highs on the eq. My guess is the speakers are just not that great to start with. Thanks for all the input from everybody.