Ferrum Audio
Ferrum OOR Headphone Amplifier
Best high-end amplifier for audiophiles seeking transparent, fatigue-free headphone listening.
Experience unparalleled audio fidelity with the FERRUM OOR Headphone Amplifier. This fully balanced analog amplifier is engineered to drive even the most demanding headphones with exceptional clarity and dynamics. Its proprietary discrete power amp technology ensures a transparent, musical sound signature with zero listening fatigue, perfect for extended sessions. Featuring intuitive front-panel controls and the option to integrate with the HYPSOS power supply for enhanced performance, the OOR offers a superior listening experience crafted with meticulous attention to analog quality.
$1995.00
Owner Satisfaction
4.8
/ 5
Category Rank
16
/ 732
#16 in Headphone Amplifiers
Price vs Category Average
+43%
Above average
Gain
461610010
/ balanced - dB, + dB, + dB / single ended - dB, dB, dB
Who it's for
- Audiophiles seeking uncolored and highly detailed sound reproduction
- Listeners wanting maximum performance through advanced power supply integration
- Owners of power-hungry planar magnetic or high-impedance headphones
Who should skip it
- Users requiring an all-in-one unit with built-in digital conversion
- Budget-conscious buyers looking for entry-level or mid-range amplification
- Shoppers wanting a complete, single-box solution without additional costs
Performance breakdown
Drive Capability
Effortlessly powers even the most demanding high-impedance planar magnetic headphones.
Sonic Transparency
Discrete circuitry delivers a clean, uncolored signal with exceptional musical clarity.
Build Quality
Robust, compact chassis design reflects meticulous attention to analog engineering standards.
Gain Versatility
Multiple gain stages ensure perfect volume matching across diverse headphone sensitivities.
System Synergy
Proprietary power link integration with Hypsos elevates performance to reference levels.
Ergonomic Simplicity
Intuitive front-panel controls prioritize a distraction-free, tactile listening experience.
Key Specs
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
Outputs
Balanced 4-pin XLR, 6.35 mm jack
Frequency Response
20 Hz – 100 kHz 0.1 dB
Output Power Balanced
1.600 mW into 300 Ω, 8 W into 60 Ω
Dimensions (W x D x H)
8.6 x 8.1 x 2.0 inch / 21.7 x 20.6 x 5 cm
Weight
1.8 kg / 3.97 LBS
Features
- Truly balanced signal path for maximum fidelity.
- Effortlessly drives any headphones.
- Ultra-low distortion and zero listening fatigue.
- Superior control for enhanced dynamics.
- Transparent and musical sound signature.
- Ferrum Power Link for HYPSOS synergy.
- Proprietary discrete power amp technology.
- Intuitive front panel controls.
What customers say
The Ferrum OOR Headphone Amplifier earns high praise for its exceptional sound quality, offering a detailed yet natural signature that avoids harshness. Users consistently highlight its superb dynamic control, making it excellent with demanding headphones. A major theme is the amplifier's synergy, especially when paired with the Ferrum HYPSOS power supply via the Power Link connection. This combination significantly elevates soundstage depth and resolution. Build quality is also commended for its compact, robust design. While the initial cost is high, serious audiophiles view the OOR as a worthwhile investment for achieving reference level musical reproduction.
Know before you buy
Yes, the OOR is designed to handle demanding headphones with ease. It delivers 1,600 mW into 300 Ω via the balanced output, ensuring plenty of power and headroom for even the most difficult-to-drive models.
Yes, it features both 4-pin XLR and 6.35 mm jack headphone outputs. On the input side, it accepts both balanced XLR and single-ended RCA connections, making it compatible with a wide range of source components.
Yes, the OOR includes preamplifier functionality. It features both XLR and RCA outputs, allowing you to integrate it into a larger stereo system to control your power amplifier or active speakers.
The OOR includes a proprietary Ferrum Power Link, which allows it to connect directly to the HYPSOS power supply. This upgrade provides cleaner, more stable power, which can further improve the amplifier's transparency, dynamics, and overall sound quality.
Yes, the OOR features adjustable gain settings to accommodate different headphone sensitivities. You can select between three gain levels for both balanced and single-ended outputs to ensure optimal volume control and noise performance.
The amplifier is engineered with proprietary discrete power amp technology specifically to minimize distortion and eliminate listening fatigue. Its transparent and musical sound signature is designed to remain engaging and comfortable even during extended listening periods.
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$1995