Ludwik Hegel reviewed our HYPSOS and ERCO in November 2022. We are happy to share his detailed review. Please take the time to visit Stereo i Kolorowo – Underground website to read the review and see some photo’s he made.
“The summary will be short. Ferrum ERCO is a reference headphone amplifier / DAC. Undoubtedly, it belongs to the world’s pantheon of the best constructions of this type. The full potential of skills and true nature is shown by the HYPSOS equipped with the company’s power supply. Such a set is already a full-fledged high-end headphone. From me, Ferrum ERCO receives the highest degree of recommendation. Well done Ferrum!” – Ludwik Hegel
