I have noticed that all the car audio shops and enthusiast in my area tend to turn down all of the bass and mid range frequencies as low as they can go, allowing their subs to handle every thing. If your turn their bass down in their subs, then it pretty much sounds like your listening to nothing but s tweeter. This also, at least in my opinion, makes the bass sound terrible, ie, muddy & boomy. Why do they do this? I am a newbi to car audio but I do have some decent experience with home audio.
Would it not be better to adjust the mid range and higher frequencies to pick up where the sub leaves off? What is the point in getting awesome component speakers if you don't listen to the mids? I figure that most quality car audio subs will go up to at least 100hz or so, and most quality mid range drivers will go down to at least 100hz. Would that be a pretty safe assumption?
How would a person go about setting up their door speakers to crossover to their sub(s) at 100h? Do door speakers need an out board crossover? If so, is that cross over adjustable to help better blend the door speakers with th sub(s)? Or is all of this taken care of with the head unit?.