Ferrum OOR + HYPSOS
The Ferrum OOR + HYPSOS delivers a transparent, dynamic headphone experience, combining exceptional insight with taut, extended bass and commanding control. HiFi News found its direct, communicative character adept at unravelling dense arrangements while preserving atmosphere, making this balanced pairing a compelling choice for full-size headphones that thrive on precision and authority.
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Nicely Roasted
Sound Quality
91/100
Build Quality
84/100
Features Usability
84/100
Value for Money
85/100
Pros
Exceptionally clear and revealing, exposing individual strands in dense recordings without disrupting tonal coherence.
Powerful dynamics, authoritative control and superbly extended bass give music real presence and drive.
Works compellingly with a wide range of full-size headphones, including balanced models such as the Oppo PM-1.
Cons
Its direct, neutral-leaning balance is less warm and lush than the Naim Uniti Atom Headphone Edition.
The bypass mode requires particular care and may risk damage to partnering equipment if used incorrectly.
Functional casework with exposed screw heads is less luxurious than the premium price suggests.
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What Reviewers Are Saying
SOUND QUALITY PERFORMANCE 91/100
The review finds the OOR exceptionally clear, detailed and dynamically commanding, with extended bass and a direct, communicative presentation. Its slightly less warm and lush character than the Naim Uniti Atom HE is the principal tonal qualification, rather than a broader criticism of musicality.
Transparency Resolution
95/100
HiFi News repeatedly praises the OOR's clarity, insight and ability to expose individual strands within dense recordings. It describes the amplifier as highly revealing, with every element of a performance open for inspection and detail that remains intact in rich, complex arrangements.
Tonal Balance Musicality
90/100
The presentation is described as coherent and natural, without odd instrumental tonalities, while combining substance with detail and atmosphere. Compared with the Naim Uniti Atom HE, the OOR gives away a little warmth and lushness, suggesting a more direct and neutral-leaning balance.
Dynamics
96/100
Dynamics and control are among the strongest themes in the review, which cites huge dynamics, superlative authority and the ability to drive hard without losing insight. Crisp beats, powerful bass extension and convincing ambience reinforce the impression of an energetic, effortless amplifier.
Noise Floor
82/100
The review praises low distortion and fatigue-free listening, but does not directly assess hiss, hum or silence with sensitive IEMs. There is no reported noise issue, though prospective IEM users would benefit from more specific listening evidence.
Headphone Compatibility
93/100
HiFi News found the OOR compelling across a wide variety of partnering headphones and specifically praises its performance with the Oppo PM-1 in balanced operation. Its ability to drive hard while retaining control and insight supports the reviewer's view that it gets the best from demanding headphones.
Assessments of Build Quality, Usability, and Overall Propositions.
Build Quality
84/100
The casework is described as smart, although the exposed screw heads give it a somewhat functional rather than luxurious appearance. The review notes a balanced signal path and in-house amplification design, but offers limited comment on long-term durability, controls or connector feel.
Features Usability
84/100
The OOR provides both a four-pin XLR balanced headphone output and a 6.35mm single-ended socket, making it convenient for a broad selection of full-size headphones. The reviewed unit is an analogue amplifier supplied with a standard 24V plug-top power supply; the review does not document DAC, remote-control, digital-input or streaming functions.
Value for Money
85/100
The review identifies the OOR as a £1,995 analogue headphone amplifier, while the supplied package pricing places the OOR + HYPSOS combination in a substantially higher premium bracket. HiFi News does not directly compare its value against competing amplifiers or offer a clear verdict on whether the asking price is especially compelling.
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Specifications
Manufacturer's Description — Ferrum
OOR can be upgraded with HYPSOS Hybrid Power System using our proprietary Ferrum Power Link (FPL) connection, making both units perform to their highest levels. While OOR performs very good right out of the box, it is made to excel above and beyond when used together with HYPSOS. Using the FPL connection means HYPSOS can measure far deeper inside OOR than it can with any other product. Not only does HYPSOS work better in this combination, OOR will also perform even better than it normally does. The truly balanced design of the preamplifier stage coupled with the discrete power amplifier technology in combination with the implementation of highly selected components is elevated to a level of its own.
Verified Dealers
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Authorized dealers for Ferrum OOR + HYPSOS
- 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)
and 48 more verified dealers