The Ferrum OOR is a terrific amplifier offering many unique design aspects, features, and huge amounts of power, all within a sleek and compact form factor.
If you’d like to see full measurements they are posted here: https://headphones.com/blogs/reviews/ferrum-oor-hypsos-review-and-measurements
Product Page: https://headphones.com/products/ferrum-oor-desktop-headphone-amplifier
Are you going to review the Violectric V550 in the future?