Ferrum Audio is a Polish high-end audio brand established in 2020 as part of HEM, a Warsaw-based engineering firm with roots in precision electronics. The company crafts premium headphone amplifiers (OOR), intelligent hybrid power supplies (HYPSOS), and acclaimed DACs (WANDLA, ERCO), all designed and built in Poland. Ferrum emphasizes robust industrial design, steel chassis, minimal controls and cutting-edge technology like fully balanced signal paths and hybrid linear-switching power systems. Their gear is celebrated for delivering detailed, dynamic, and natural sound. Known for award-winning innovation, Ferrum continues to expand with streamer and stereo amp developments in progress.