The Cerafine ROA series is a capacitor specially designed by ELNA for audio. It uses OFC oxygen-free copper feet, extremely low distortion (third harmonic distortion -120dB), and small tangent loss. The powder diameter is controlled between 0.1-0.15 microns. According to the manufacturer, this technology has two major benefits: First, it increases the damping effect on external vibrations. The second is that when the capacitor is charged and discharged, the injected ceramic powder will absorb the negative ions in the electrolyte and become more active ion groups, forming a thin film on the surface of the anodic oxide film, which greatly improves the response speed to the signal and improves the sound quality. It is purer and more transparent, but it comes at the cost of being bulky and expensive. The sound is relatively soft, the mid frequency is warm and soft, the high frequency is more gorgeous, and the fog is slightly heavier.