Where did you ground your aftermarket stereo?
 

I just finished getting my stereo installed, and have a slight alternator whine. Just wondering where everyone grounds their equipment! I have an Alpine IVA-C801 head unit with remote brain. The brain is installed under the passenger seat..

The Amplifier, DSP/EQ are installed in the front trunk, grounded near the screw for the spare tire.

Anyone else have input? Where's the best place to ground all the equipment?

-Richie