I really need to say something here. All of your gronding electrodes need to terminate at your main AC neutral in the first means of disconect on your electrical service. This is code period! There is a reason for this. By creating a seperate grounding electrode system for your audio equipment, you have also created a difference of potential in your electrical system. Any surge or noise that is on the line, will follow the grounded conductor (ie neutral) right through your equipment and out to your seperate ground grid. These would normally be handled right at the service entrance. If you want to improve your ground, do it at the service entrance. Your water pipe should bond at the main AC neutral. Any verticle steel posts can be bonded to this point also. The driven ground rods (electrodes) bond to this point. If you have a well, bond it to this point. Everything will reference BACK to this point! Not through it and into your system. Isolated grounds also bond back to the main AC neutral! Ground and neutral are the same potential at the servce entrance for a reason. They are kept apart from there on out. Even in sub panels. Sorry if I sound like I'm venting, but you could cause more harm than good.
