How to improve car audio sound?

i have a good sound system! BUT i kno i can improve the quality a lil more....i have 4 jvc speakers, pioneer sub, sumkind of amp, and a jvc stereo. im not sure of the wattage on all of this but i had no blowouts. um on the stereo there is an EQ i have it set to user (my own settings). theres an option on there called LOUD, when i turn it on it sounds wayyy better but the bass is too hard lol. even if i lower the Hz's....wat is the best setting to get this to sound best!. im talking about the Bass, Treble, and Mids. does anyone kno how to help me with that?
 
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