My new Head Unit Messed up myu system!?

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I had a stock radio in my Gallant and it used to beat so hard.
Now that I installed a brand new pioneer deh-p4000UB my system sounds bad
does anyone know how to fix this.
 
Your gallant may have a passive external amp somewhere in your car and it's not turning on. Where as your stock stereo did interact with the stock amp.
 
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