Audio Mijinko SILVER HARMONIZER AC Virtual Earth This is a used item. Only the main unit is for sale. In my environment, it showed outstanding cost performance compared to products like acoustic revive, and had the effect of making the sound beautiful and resonant. It is in relatively good condition. No pets, non-smoking environment. I would appreciate it if those who understand used items would purchase it. The SILVER HARMONIZER AC is a parallel noise filter + virtual earth effect device that connects directly to an empty outlet. It is an audio accessory belonging to the virtual earth (earth connector) and noise filter common to the Silver Harmonizer. In addition to being used as a virtual earth for pure audio and portable audio audio systems, we have received reports that it has also been effective in improving sound quality as a car earth connector when using AC power in a car via a DC-AC converter. 〈Noise Filter Structure〉 By adopting a capacitor-type parallel method, current limitation is completely eliminated. In addition, the noise generated from the device itself is theoretically zero due to the passive method. With the above two methods, we have been freed from the side effects of serial noise filters, which tend to create a feeling of suppression in the sound. Several types of capacitors were checked in blind tests, and the optimal combination was selected. By improving the S/N ratio, we have achieved an open and bright tone and a beautiful decay that does not make you feel limited in the high frequencies.