Influenced by the early Wax Trax! music, Eric Powell launched industrial/rock band 16volt in the early 90s and put out a string of acclaimed albums. 16volt went on hiatus after their 2011 “Beating Dead Horses” album, with Powell shifting his focus to another project, Black December. But now he’s back with a new, self-released 16volt album, “The Negative Space.” In a phone interview, Powell discussed the return of 16volt.