SILVER HARMONIZER AC Price: 12,000 yen (tax included) The SILVER HARMONIZER AC is a parallel noise filter + virtual earth effect device that connects directly to an unused AC outlet. It is an audio accessory that belongs to the virtual earth (grounding device) and noise filter categories, common to the Silver Harmonizer series. I am selling it because I replaced it with a new one. (From the manufacturer's description) It is in relatively good condition, but please refrain from purchasing if you are overly concerned about its condition, as it is a used item.