I installed my d3 yesterday and i noticed that the sound quality is cheap.... has no bass tweeters are popping if i put it a little bit louder and i was wondering what settings you made to make the sound better

Use the EQ presets or custom your own.

First thing to do it turn off the soundstage enhancement thing. That messes with the levels a lot. Then experiment with different EQ settings, loudness, fade and balance.

Adjusting the EQ can really anhance the sound....sub settings...highs lows mids, etc

Just curious, but what kind of car is this in? Amps? (factory or aftermarket) Wiring harness adapter used with install? Almost sounds like a phase problem to me. A little more info than "sounds cheap" might help you get a more accurate diagnosis/solution