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I had the Silver Tellus and Posidon.
I connected the Ground Master to the a Rod which goes down 20 meters into the ground. I had someone come in to drill very deep. Here in Indonesia we use Ground Water which is filtered so another part of the garden was used just for grounding rods.
Puritan just worked allot more better for me in my room.
i think 1 meter is too short, you should prob be doing atleast 2-3 meters deep but this is a guess.
I am told by another electrical engineer the deeper the better but Puritan claims 1 meter should work fine. Iv never tried 1 meter but if it works fine it can save the hassle and cost of using longer copper Rods and the cost/expense of drilling.
I have two Groundmaster City units. One, for signal grounding, is connected to unused rca plugs on my Pathos TT RR integrated, and Modwright Marantz SA8005 sacd player. It replaced a Gutwire Perfect Ground cable on the Pathos amp, which provided a subtle reduction in noise/increase in articulation and musicality. I tried to use a 2nd Gutwire grounding cable on the sacd player but it must have created a ground loop because I gut hum. Just comparing the Groundmaster City with the Gutwire cable on the amp, the Groundmaster unit is about 40% better. And connecting a Groundmaster City to both amp and player at the same time created no hum or other issues, and surprised me with the resulting improvement in sound quality. My system had no obvious noise or electronic artifacts to begin with, but with source and amp connected to the Groundmaster city the sound was noticeably more relaxed, natural, and articulate. My 2nd Groundmaster City is for chassis grounding. It will be connected to casework screws on my Bybee Stealth Power Purifier and Modwright PS 9.0 power supply, once I receive the cables I ordered for this purpose.