Ferrum OOR Headphone Amplifier

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 honourable 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 unrivalled 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 unrivalled detail result in ultimate enjoyment. OOR actually makes something that is very difficult to accomplish, seem like the most natural thing on earth.

Features:

The signal path stays truly balanced using the XLR inputs and becomes truly balanced using the RCA inputs.
Only three knobs on the front panel to control the most important settings.
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.
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.
The whole design is focussed on a balanced and very transparent sound signature, making listening fatigue something of the past.
The discrete power amp technology is developed in-house to achieve the best possible analogue quality.

Gain: 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
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: 217 (W) x 206 (D) x 50 (H) mm
Weight: 1.8 kg

Turnaround

Orders will usually dispatched within 2 working days of receiving cleared payment.

Shipping Rates

We calculate your shipping rate based on the total weight of your items and your delivery address. Standard shipping to the UK Mainland (excludes Northern Ireland, Isle of Man, Channel Islands) is free, except where specifically indicated. Don't worry, you'll always see the final shipping charge displayed before you reach the payment step (on the checkout page).

Carriers

We despatch the bulk of our UK mainland items on a 24 hour service.  Non-Mainland locations – Isle of Man, Isle of Wight, the Scilly Isles, the Scottish highlands and Islands, the Channel Islands and Northern Ireland may take a day or so longer. Smaller items are delivered using Royal Mail 24 or special delivery. Larger items are delivered using a courier service such as UPS and occasionally by a Pallet service.

Order Tracking

If a tracking # is provided by the carrier, we will update your order with the tracking information. Please note that some orders will not have tracking numbers.