There are two issues here, IMO. First is the stability of the cabinet, which is a function of construction, TT mass, and the ratio of the height to the smaller of depth and width. The second is sinking transients to ground.
The solution which I found, because my 150 lb TT dictated it, was to lengthen the width of my cabinet to 40 feet, by the simple expedient of bolting it to the frame of the house. This also served to sink transients to the frame and thence to the concrete foundation. Problem solved. Of course, the wife doesn't yet know there are holes in the Louis XIV desk ...
The solution which I found, because my 150 lb TT dictated it, was to lengthen the width of my cabinet to 40 feet, by the simple expedient of bolting it to the frame of the house. This also served to sink transients to the frame and thence to the concrete foundation. Problem solved. Of course, the wife doesn't yet know there are holes in the Louis XIV desk ...