This SGS-1 from Signal Ground Solutions is the original grounding box I bought and is a very effective starter into the world of grounding boxes.  It certainly brings about gains in soundstage width and depth and overall enhancement of the transparency and purity of the music.  My only reason for sale is that I discovered two boxes don't work well in the same system, so I'm keeping the larger SGS-1s.

signalgroundsolutions.com/

Complete with Black Ravioli feet.  No cables included.  £150 including free shipping to UK destinations.


SGS 1 by Martin Taylor, on Flickr