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If you use the ground in the gang plug for the head unit you can wind up with a slightly different ground than you have at the amps (same is true if you just ground the headunit on an open bolt in the dash somewhere). The head unit is connected to the amps via RCA cables which also have a ground (shield). If there is a small potential difference between the head unit ground and the amp ground you will get what is called a group loop flowing on the RCA shields which will introduce (primarily) alternator noise. The best way to avoid this is to run a dedicated 10 or 12 gauge wire from the head unit back to where the amps are grounded. Connect all electronics grounds for the stereo system at the amp ground (if you use that active crossover ground it at the amp's ground as well).
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