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Read the review here:
https://www.monoandstereo.com/2021/10/signal-ground-solutions-sgs-1-signature.html#more
SGS is a small company located in Scotland. They have been quietly researching and developing grounding technology for the past 5 years. In a soft launch in 2017, they brought SGS1 Signature to the market.
CONCLUSION
Signal Ground Solutions SGS-1 Signature does a lot! The lower noise, the dynamic effects, the potential horizontal and vertical enhancement, the better holographic presentation, the advanced vividness, the more precise materialization of instruments and performers, the transparency, the more correct timbre, tone, and color, etc.
Have now heard one of these grounding boxes at SOS and boy they really do make a difference, and it was not subtle.
Loved what the Zebrano has brought out in my system, never knew all the nuances that the system was capable of. Just wonderful.
Just unbelievably what this did for Sounds Of Silence’s system. If I didn’t hear it for myself I would never have believed. Unfortunately it’s a bit out of price point but it will be something I save up for.
Add me as a believer too. Initially very skeptical but now I really can appreciate what these grounding boxes can do. Very impressive!