subwoofer making a humming noise

[Carsonb99]

hey guys, everytime I crank my truck my subwoofer starts to hum, sometimes it is louder than other times but when I just turn on the truck, without starting the engine, it doesn't hum, I have changed out the ground wires plenty of times thinking it was it any clue on why it is doing it, I have a soundstream ta1 3000d and Its hummed with several different sets of speakers(same amp)

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[trumpet 5,000+ posts]

Plug in your phone or an iPod/other media player straight into your amp with a 3.5 mm to RCA adapter cable and play music with the engine off and then with the engine running. Let us know the outcome.