I have a question I'm hoping some of you could help me with.

Disclaimer: I know some might chime in and debate where to ground your amps. Some people say as close to the amps as possible, and some people (i.e. JL Audio) say to ground back to the battery. That's not really the question I have. With that said here's the question:

Is there any issue (cost aside) with grounding (via a dist. block) as close to the amps as possible, AND then also running a ground all the way to the battery?

I currently have four PPI amps (a100, 2xa600, a1200). Ground is provided by 4gauge from each amp to a dist. block. From the dist block I go 0/1gauge all the way to the battery. Running the ground back to the battery was PERFECT for my old two amp set up. However, the new setup there's introduced engine whine/alt noise.

I've troubleshooted the entire system, and have come to the conclusion that it must be way too much power to only depend on the 0/1gauge ground back to the battery. Fixing it will be easy, I'll just ax the ground to the battery, and ground closer to the amps.

So, back to the question. Before I take the above actions, I'd like to know if there is any 'harm' or disadvantage in keeping the ground back to the battery and ADDING a ground to the frame closer to the amps? Here's a graphic to help clarify my Q:



Thanks all!

-biju.