Ferrum
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Features
Truly balanced signal path from input to output, including RCA inputs converted to fully balanced operation
Proprietary discrete power amp technology developed entirely in-house for superior analog purity
Ferrum Power Link (FPL) connector for seamless pairing with the HYPSOS Hybrid Power System, unlocking peak musicality
Ultra-low THD of 0.00008% (-122 dB) on unbalanced output — distortion at virtually inaudible levels
130 dB A-weighted dynamic range for effortless macro- and micro-dynamic expression
Three selectable gain stages for both balanced and single-ended operation to match any headphone
Balanced 4-pin XLR and 6.35mm headphone outputs for broad compatibility
Dimmable front logo for fatigue-free, low-light listening sessions
Handcrafted by a team of engineers and industrial designers in Warsaw, Poland
What's in the Box?
Warranty
When our HYPSOS won an EISA award in 2021, we knew we were on the right track and went on to follow our dreams of delivering the best possible audio gear we could think of. When we learned OOR was chosen by the honorable EISA members as best Headphone Amplifier of 2022-2023, all our dreams came true. As did HYPSOS, OOR is a ground-up design without precedent, created from a profound exploration of analogue audio in its purest form. Understated looks married with sophisticated power delivery and amplifier technologies, delivering ultra-low distortion, huge dynamics, and unrivaled detail. For those who want to go even further in unleashing unheard musicality, OOR is, of course, designed to pair perfectly with the HYPSOS Hybrid Power System.
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. Ultra-low distortion, zero fatigue, huge dynamics, and unrivaled detail result in ultimate enjoyment. OOR actually makes something very difficult to accomplish seem like the most natural thing on earth. The most important features are:
Truly Balanced
The signal path stays truly balanced using the XLR inputs and becomes truly balanced using the RCA inputs.
Ease of use
only three knobs on the front panel to control the most important settings.
Ferrum Power Link
OOR performs very, very well right out of the box. But OOR is made to excel above and beyond when used together with HYPSOS. We use what we dubbed our Ferrum Power Link (FPL in short) to connect the two. HYPSOS will then perform to its maximum, unleashing unheard musicality from the combination with OOR.
Superior control
perfected steering of output transistors protects them and never lets them turn off, therefore reducing distortion to inaudible levels and keeping them in a state where they can instantly unleash all their power, crucial for high dynamics, superlative control, and authority in sound.
Enhanced transparency
The whole design is focused on a balanced and very transparent sound signature, making listening fatigue something of the past.
Discrete design
The discrete power amp technology is developed in-house to achieve the best possible analog quality.
| Parameter | Specification |
|---|---|
| Physical Specifications | |
| Dimensions (W x D x H) | 8.6 x 8.1 x 2.0 in / 21.7 x 20.6 x 5 cm |
| Weight | 1.8 kg / 3.97 lbs |
| Technical Specifications | |
| Operation | Fully balanced, proprietary discrete power amp technology |
| Gain (Balanced) | -4 dB, +6 dB, +16 dB |
| Gain (Single Ended) | -10 dB, 0 dB, +10 dB |
| Inputs | XLR, RCA, 2.5 mm DC connector (center positive), proprietary 4-pin DC connector |
| Headphone Outputs | Balanced 4-pin XLR, 6.35 mm jack |
| Balanced Input Voltage | Max 19 VRMS, recommended 3–12 VRMS |
| Unbalanced Input Voltage | Max 9.5 VRMS, recommended 1.5–6 VRMS |
| Input Impedance | 94 kΩ |
| Output Impedance (Single Ended) | 22 Ω on pre-amp |
| Output Impedance (Balanced) | 44 Ω on pre-amp |
| Output Impedance (Headphones) | < 0.3 Ω |
| Audio Specifications | |
| Frequency Response | 20 Hz – 100 kHz ±0.1 dB |
| Output Power (Single Ended) | 400 mW into 300 Ω 2 W into 60 Ω |
| Output Power (Balanced) | 1,600 mW into 300 Ω 8 W into 60 Ω |
| THD (Balanced Output) | 0.00011% / -119 dB at 1 mW into 50 Ω 0.00028% / -111 dB at 100 mW into 50 Ω |
| THD (Unbalanced Output) | 0.00008% / -122 dB at 1 mW into 50 Ω 0.00028% / -111 dB at 100 mW into 50 Ω |
| Dynamic Range | 130 dB (A-weighted) |
| Power Specifications | |
| Power Consumption | < 15 W (idle) |
| Power Adapter | 100/240 V AC to 22–30 V DC |
| Additional Information | |
| Price | 1,995 EUR/USD |