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    mach 460 - aftermarket HU turn on thump?

    I just installed an aftermarket HU (pioneer deh-p390mp) in my 2000 mustang gt with the mach 460 system. I used the Metra 70-5510 with the rca plugs and it sounds great, very solid bass. but, I do have a slight problem. whenever I turn on the car (engine and all), I hear a thump coming from...
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