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Ferrum OOR Fully Balanced Headphone Amplifier

Ferrum OOR Fully Balanced Headphone Amplifier
Ferrum OOR Fully Balanced Headphone AmplifierFerrum OOR Fully Balanced Headphone AmplifierFerrum OOR Fully Balanced Headphone AmplifierFerrum OOR Fully Balanced Headphone Amplifier
(£1,662.50 Exc. VAT)

Delivery In 1-3 Days

Free U.K. Delivery


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01892 532 995

  • Truly Balanced
  • Ferrum Power Link
  • Enhanced transparency
  • Ease of use
  • Superior control
Ferrum Audio
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Why buy from us?

Ferrum OOR Fully Balanced Headphone Amplifier

OOR, the only headphone amplifier with a soul

The 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. 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 Ferrum 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.

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.

The Ferrum 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.

Shipping typically 1-3 days

Truly Balanced
The signal path stays truly balanced using the XLR inputs and becomes truly balanced using the RCA inputs.

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.

Enhanced transparency
The whole design is focussed on a balanced and very transparent sound signature, making listening fatigue something of the past.

Ease of use
only three knobs on the front panel to control the most important settings.

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.

Discrete design
The discrete power amp technology is developed in-house to achieve the best possible analog quality.

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 centre positive, proprietary 4-pin DC connector
Outputs: Balanced 4-pin XLR, 6.35 mm jack
Frequency Response:  20 Hz – 100 kHz 0.1 dB
Output Power Single Ended: 400 mW into 300 O, 2 W into 60 O
Output Power Balanced: 1.600 mW into 300 O, 8 W into 60 O
THD + Noise: TBA
Input Impedance: 94 kO
Output Impedance Single Ended: 22 O on pre-amp
Output Impedance Balanced: 44 O on pre-amp
Output headphones Impedance: < 0.3 O
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

UK Delivery

  • FREE delivery via DPD Local By 12pm on orders to value over £300, including one hour delivery window service 'Predict & Follow My Parcel'.
  • Royal Mail Special Delivery By 1pm costs between £5.00 - £10.00 on orders to value under £300, dependent on weight.
  • Saturday or Sunday delivery available upon request for supplemental charge.

EU Delivery

  • £25 delivery charge 'Flat Fee' via DHL Europe by Road service (5-7 days) which provides comprehensive tracking of shipments online.
  • £50 delivery charge 'Flat Fee' via DHL Europe by Air service  (2-3 days) which provides comprehensive tracking of shipments online.
    Receiver is responsible for the payment of local Duties and Taxes.

USA & Canada Delivery

  • Services based on your order being shipped to the U.S. and Canada are calculated as follows:
    £100 delivery charge 'Flat Fee' via DHL international 'Day Definite' service per parcel.
    Receiver is responsible for the payment of local Duties and Taxes.


  • Not all products are available for order into Europe, USA & Canada


  • Full manufacturer's warranty on all new purchases. Standard warranty is typically 12 months to 2 years with some goods coming with 6 years manufacturer's warranty.
  • Goods purchased in UK and EU are covered by the Consumer Contracts Regulations.

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