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In all audio installs the equalizers are always wired in before the crossover. In many system diagrams people have 2 equalizers (one for left, one for right), going into one crossover. Can someone please explain to me why this is and how this works to improve your sound quality.

 
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The wonderful enclosed car environment with it's soft seats and hard plastic panels offer all kind resonation and sound absortion. This leaves frequency peaks and dips in your system... the equlizers..if used properly can virtually eliminate these by boosting freuqncies which are absorbed..and cutting the output on frequencies which resonate and grow louder in the car...

 
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My main question was how the two work in conjunction, and why the eq's are always wired in before the crossovers.

 
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Ahh well each left and right chanel have different objects and such their bouncing off of.. each side must be properly equalized..

 
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I was talking about the two equalizers going into one crossover. Why are the eq's always before the crossovers. Also how do the two eq's work with one crossover?

 
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crossovers outputs are left and right channels..same as the inputs... hook the left RCA to the corrover for the left side speaker and so forth

 
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I understand what you are saying. I'm no expert but here is my guess. Having the eq's infront of the crossover sends the adjusted signal into the crossover to be sent high or low, causing the GOOD signal to be crossed. Placing them after the crosover would have the eq adjust the signal AFTER it has had the lows or highs blocked off, hence not letting the eq perform to its full potential. The only reasoning I can come up with for having 2 eqs into 1 xover would be a high and a low eq to further enhance the xover.

Just my thought

 
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its like putting an EQ after the crossover for a component speaker set. you want teh EQ to level ALL freq. for yoru car, not for JUST teh tweeter. therefore, the crossover goes after teh EQ>

the reason to have 2 EQ its cause they need a seperate left right EQ. some EQ have a left and right built in, so only one is neccesary.