OOR, the only headphone amplifier with a soul
and a second EISA award!

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 that is 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 good 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 then will perform to its maximum, unleashing unheard musicality from the combination with OOR.

Superior control

perfected steering of output transistors protect them and never let 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 focussed 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.

Look and behold the understated looks of OOR’s front, only to camouflage it's intricate design laid bare on the rear. 100% analogue, 100% natural, 100% musical.
Fully balanced from A to Z, even right after the RCA inputs, to get the max out of any headphones. Brightness of the logo on OOR’s front can be dimmed for ease on the eyes. Ferrum Power Link for ultimate connection with HYPSOS.
Combine OOR with HYPSOS to unleashing unheard musicality. Together they will excel above and beyond.
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OOR is made by a group of very talented engineers and industrial designers, right in the heart of Poland. They like to refer to Ferrum as "Brand of Brothers". OOR is their instrument of choice when they need to completely relax and prepare for their next assignment.
Marcin HamerlaFounder and CEO HEM

Unique output cable design: two wires delivering the power and two wires providing the feedback to ensure flat voltage at every moment. We named this technique Ferrum Power Link (FPL) and it eliminates the harmful effects of the cable's resistance effectively improving transient response. The current delivery speed at the powered device's input is significantly improved.

OOR comes with a carefully selected DC power adapter. To get the most out of OOR you can connect it with HYPSOS using our proprietary Ferrum Power Link DC power cable. This FPL cable can be ordered separately.

5 OOR_front_EISA
6 OOR_rear_EISA
IMG_2398 copy
IMG_2404 copy
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Price

1995

EUR/USD
  • OOR fully Balanced analogue headphone amplifier
  • Proprietary discrete power amp technology
  • Proprietary 4-pin Ferrum connector for HYPSOS
  • Balanced 4-pin XLR and unbalanced RCA headphone outputs
BUY
  • Gain (dB):balanced -4 dB, + 6dB, +16 dB / single ended -10 dB, 0 dB, 10 dB
  • Operation: Fully balanced, proprietary discrete power amp technology
  • 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
  • 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 on balanced output:  0.00011% / -119 dB, 1 mW into 50 Ω;  0.00028% / -111 dB, 100 mW into 50 Ω
  • THD on unbalanced output:  0.00008% / -122 dB, 1 mW into 50 Ω;  0.00028% / -111 dB, 100 mW into 50 Ω
  • Dynamic range: 130 dB (A-weighted)
  • Input Impedance: 94 kΩ
  • Output Impedance Single Ended: 22 Ω on pre-amp
  • Output Impedance Balanced: 44 Ω on pre-amp
  • Output headphones Impedance: < 0.3 Ω
  • Power Consumption: Idle <15 W
  • Power Adapter: 100/240 V AC to 22-30 V DC
  • Dimension (W x D x H) (In/cm): 8.6 x 8.1 x 2.0 inch / 21.7 x 20.6 x 5 cm
  • Weight (kg/lbs): 1.8 kg / 3.97 LBS
  • Price: 1.995 EUR/USD
  • DOWNLOAD THE OOR WHITE PAPER

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