Ferrum OOR
Ferrum OOR delivers a clean, neutral window into demanding headphones, pairing exceptional resolution with low-noise contrast, crisp separation and firm driver control. 6 Moons found it especially convincing with difficult planars, while Reviews By WaveTheory praised its holography, versatility and Susvara synergy. Add the optional Hypsos for tunable tonal weight and even greater refinement.
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Nicely Roasted
Sound Quality
90/100
Build Quality
89/100
Features Usability
87/100
Value for Money
85/100
Pros
Highly resolving, clean and low-noise presentation with strong separation, air and transient precision.
Substantial power and control for demanding planars, with particularly strong bass authority and dynamics on HIFIMAN Susvara.
Flexible gain structure and broad headphone compatibility, handling varied loads without reported noise issues.
Optional Hypsos power supply enables useful tonal tailoring and elevates contrast, control and listening ease.
Cons
Soundstage is comparatively narrow, despite strong depth, imaging and holography within it.
Dynamics can sound smooth or merely average with some headphones, rather than consistently hard-hitting.
The optional Hypsos supply adds significant cost for the amplifier's best performance and tonal adjustability.
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What Reviewers Are Saying
SOUND QUALITY PERFORMANCE 90/100
Reviewers describe a clean, neutral and highly resolving presentation with strong separation, holography and control. Its main sonic qualification is a comparatively narrow stage and dynamics that can sound restrained with some headphones, though the Susvara pairing drew praise for large-scale swings and bass authority.
Transparency Resolution
93/100
6 Moons heard greater resolution, air, transient vigor and stronger contrast against silent space with the OOR/Hypsos combination. WaveTheory likewise calls out excellent resolution, detail retrieval, clean sound and convincing holographic separation.
Tonal Balance Musicality
89/100
WaveTheory found the OOR very neutral, clear, dry and generally free of harshness, sharpness or shout. 6 Moons similarly heard no added coloration, excess body or bloat, but one pairing brought forward glare and could become fatiguing.
Dynamics
87/100
The OOR has the control and power to produce substantial dynamic swings with the Susvara, particularly with the Hypsos supply, and 6 Moons praised its timing, damping and transient behavior. WaveTheory nevertheless found its general presentation only average in punch and impact, with dynamics varying substantially by headphone pairing.
Noise Floor
90/100
6 Moons specifically describes extremely low noise and an enhanced contrast between musical substance and silent space. The supplied reviews do not report hiss, hum or other background-noise concerns.
Headphone Compatibility
91/100
The low-impedance output stage, selectable gain structure and substantial balanced power support demanding headphones, with both reviewers highlighting its control of the HIFIMAN Susvara. WaveTheory also describes it as a capable all-rounder, although the supplied reviews offer little direct evidence with sensitive IEMs.
Assessments of Build Quality, Usability, and Overall Propositions.
Build Quality
89/100
6 Moons reports a steel chassis with an aluminum front panel and says the fit and finish look impressively sorted even at close range. The reviews provide no long-term reliability or control-wear observations.
Features Usability
87/100
OOR provides balanced and RCA inputs, 6.3mm and four-pin XLR headphone connections, RCA/XLR line outputs, and useful selectable gain settings. It is an intentionally focused analog amplifier/preamp rather than a DAC/amp, so there are no reported digital inputs, wireless functions, remote control or DSP facilities.
Value for Money
85/100
At €1,995, with the optional Hypsos adding €995, the OOR is positioned as a premium amplifier. The reviews praise its performance but do not directly assess whether it outperforms competing amplifiers at its asking price.
Reviews & Sources
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Specifications
Manufacturer's Description — Ferrum
OOR will redefine the category of headphone amplifiers. OOR will drive any headphones effortlessly to the max of their potential, while preserving the essence of the music it amplifies. Zero distortion, zero fatigue, huge dynamics and unrivaled detail result in ultimate enjoyment. OOR actually makes something that is very difficult to accomplish, seem like the most natural thing on earth.
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Authorized dealers for Ferrum OOR
- The Audio Association — in-store — Anaheim, California, United States (website)
- Aalen Hifi — in-store — Schwäbisch Gmünd, Baden-Wurtemberg, Germany (website)
- Audio 46 — online and in-store — New York, New York, United States (website)
- Audio Affair — online and in-store — Deritend, England, United Kingdom (website)
- Audio Art Cable — online and in-store — San Diego, California, United States (website)
- Audio Destination — online and in-store — Tiverton, England, United Kingdom (website)
- Audio essence — online and in-store — Zürich, Zürich, Switzerland (website)
- Audio Magic - EU — online and in-store — Wola, Województwo mazowieckie, Poland (website)
- Audio Sanctuary — in-store — London, England, United Kingdom (website)
- Audio Venue — online and in-store — London, England, United Kingdom (website)
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