Ferrum Audio OOR plus HYPSOS inc. DC POWER LINK Cable

Ferrum OOR Balance Headphone Amp With HYPSOS Power Supply

Overview

The Ferrum Audio OOR System brings together three precision-built components designed to perform as one. Combining the OOR Balanced Headphone Amplifier, the HYPSOS Hybrid Power Supply, and the Ferrum Power Link (FPL) DC Cable, this system delivers the perfect balance of musical power, control, and refinement. Built in Poland, it represents Ferrum Audio’s purest expression of headphone performance.

At the centre of the system is the Ferrum Audio OOR, a fully balanced analogue headphone amplifier and preamplifier. OOR is designed to preserve musical integrity, revealing fine detail while maintaining warmth and natural tone. Its discrete circuitry provides incredible speed, low distortion, and effortless drive across a wide range of headphones. The result is a sound that feels fluid, dynamic, and deeply engaging.

The OOR amplifier supports both balanced 4-pin XLR and 6.35 mm headphone outputs, offering flexibility for any setup. It also functions as a balanced preamplifier, integrating seamlessly into larger hi-fi or studio systems. With its silent background and transparent presentation, OOR delivers precision and musicality in equal measure.

Supplying the foundation of the system is the Ferrum Audio HYPSOS Hybrid Power Supply, combining linear and switch-mode technologies in one intelligent design. HYPSOS delivers ultra-stable, low-noise power within a 5 V – 30 V DC range, ensuring absolute voltage consistency and outstanding transient response. Its hybrid architecture provides the speed, efficiency, and tonal smoothness that define Ferrum’s sonic character.

HYPSOS incorporates Ferrum’s 4-Terminal Sensing Design (4TSD), which eliminates voltage loss across the power cable, guaranteeing the exact voltage reaches OOR’s input. The Sweet Spot Tuning (SST) feature allows fine adjustment of output voltage to achieve optimum synergy between components. The result is clean, effortless sound with remarkable dynamic precision and tonal balance.

Connecting the amplifier and power supply is the Ferrum Power Link (FPL) Cable, built to maintain perfect voltage accuracy and signal integrity. Using a 4-pin Weipu DC connector, the FPL features dedicated lines for both power and voltage feedback. This ensures the OOR receives pure, stable energy directly from HYPSOS, free from resistance-related losses and interference.

The entire system shares Ferrum’s clean, compact design language and precise aluminium chassis construction. Each unit fits neatly in a desktop or rack configuration, offering a sleek and unified appearance. The build quality reflects Ferrum’s dedication to long-term reliability, precision engineering, and minimalist elegance.

Together, the OOR, HYPSOS, and FPL Cable create a system that captures music’s emotion and energy with absolute honesty. The amplifier provides natural drive and control, the power supply ensures low-noise consistency, and the cable unites both with precision feedback and clarity. The synergy between these three components transforms how headphones reproduce detail, depth, and dynamics.

For Groove Central listeners seeking reference-grade sound in a compact and flexible setup, the Ferrum Audio OOR System is the ultimate solution. It combines cutting-edge design, exceptional craftsmanship, and intelligent power management to deliver a listening experience that feels truly alive.

Key Features

• OOR fully Balanced analogue headphone amplifier 

• Proprietary discrete power amp technology

• Balanced 4-pin XLR and unbalanced RCA headphone outputs

• Linear/switching hybrid design to get the advantages from both techniques - low ripple and noise as well as fast transient response and high efficiency.

• Detailed and revealing sound without being fatiguing.

• With the "Ferrum Power Link", the OOR can be made to excel even further when used with the HYPSOS power supply.

For More Technical Information... 

OOR + HYPSOS by Ferrum Audio - Video Review From Soundnews ...

For Soundnews written review please check out their site!

For More Information

Visit the manufacturer's website.

Returns Policy

groovecentral.com.au handles returns and processes refunds in accordance with the Australian Consumer Protection legislation.

Should you wish to return your order, please notify us within 14 days of purchase with a valid reason for return. If we are unable to resolve your complaint or further assist you, we will process a refund upon timely receipt of the goods purchased. Unopened goods will be refunded in full. Refunds will be processed promptly and payment made by the same method that you made payment. All refunds are made at the discretion of groovecentral.com.au.

Shipping

Physical goods may be delivered by Australia Post and/or other reputable courier companies. Deliveries are processed promptly upon receipt of full payment. Delivery may take between 2 and 14 days, depending on the delivery option. Damaged or lost orders should be resolved with Australia Post or the courier company directly and we are not responsible for goods that are damaged in transit or not received. Replacement of damaged or lost items is made at the discretion of groovecentral.com.au.

Digital goods are delivered immediately. Please be aware there are inherent risks associated with downloading any software and digital goods. Should you have any technical problems downloading any of our goods, please contact us so we may try to assist you.