whine with accelaration

After installing a second amp and a new equalizer i now have i whine when i accelerate. Now im no expert but i've heard this is caused by a bad ground but i checked it out and it seems to be fine.  Could something else be wrong? What should i do??

Sounds like a ground loop.  Run a pigtail between all of the component's grounds, make sure you have a good grounding path to the battery on every component,  and definately make sure your signal and power cables are at least 6 inches from each other.  Also tie any signal cable that have to pass a factory wire loom at a 90 degee angle (adjacent) to the loom.  Make sure to properly line match all of your components, too....