I am a friend of Eds and I installed his grounding per NEC 250.32. See Exhibit 250.19 in your NEC 2014 Handbook to see an image of my installation.
I always keep audio ground rods more than 10 feet away from other grounds to reduce the chance for ground loops through earth. See NEC 250.53. Grounding electrodes are required to have minimum spacing. They are not suppose to be near each other.
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