A jewel box of sound that condenses high quality without compromise! – By Reiji Asakura
I learned the name of Poland’s Ferrum Audio from the DC power supply HYPSOS for audio that I experienced last fall. I was surprised that the small DAC improved the sound quality overwhelmingly compared to the power supply from the attached AC adapter. Ferm Audio also released new products in rapid succession, such as the USB DAC/preamplifier ERCO with a built-in headphone amplifier with a width of 217mm, which is almost the same as HYPSOS, and the headphone amplifier OOR, demonstrating its vigorous product development capabilities. . In this article, I will listen to these three in length and breadth.