Where do I ground the amp in the trunk? I grounded it where the hooks are located in the trunk but I get a faint whining noise coming out of the speaker. Is there anywhere else i can ground it to elimanate the noise.
I have a 2002 lexus gs 300

 

take out the rear seat and you'll have plenty of places for ground you can tap into. i grounded to the rear "x" brace with a bolt and it works fine.