Tpsonic, Sound Lab builds proper crates for all of their products, as they don't care to have them come back broken. Their backplates are designed to fit into the rear frames or enclosures without charged components being exposed - it is something they cannot risk. Likewise, there would not be a risk of shock even with the Ultimates which employ tubular steel frames for increased rigidity when the backplates are installed per factory instructions. As for arcing panels, although this rarely occurs, I don't see why this would be a factor, as they are not electrically attached to the frames...I should know, I am a Sound Lab dealer and own Ultimate-1s. You might discuss such concerns with the good folks at Sound Lab before making such statements, as they really do care and always try to do the right thing. Sound Lab has been successfully making their electrostatic loudspeakers for twenty five years and has diligently dealt with all aspects of their products, and they continue to service virtually every model made. Since the mid 80s they have made evolutionary updates to their full range electrostatics, conservatively employing new technologies and materials only after exhaustive in house testing. The results speak for themselves.
Brian
Brian