Ferrum Audio OOR Fully-Balanced Analogue Headphone Amplifier

OOR was chosen by EISA members as the best Headphone Amplifier of 2022-2023.

Created from a profound exploration of analogue audio in its purest form. OOR delivers understated looks married with sophisticated power delivery and amplifier technologies, 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 amazing detail result in ultimate enjoyment. OOR actually makes something that is very difficult to accomplish, seem like the most natural thing on earth.

Truly balanced - the signal path stays truly balanced using the XLR inputs and becomes truly balanced using the RCA inputs. The whole design is focussed on a balanced and very transparent sound signature, making listening fatigue something of the past.

OOR is easy to use, with only three knobs on the front panel to control the most important settings. 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 discrete power amp technology is developed in-house to achieve the best possible analog quality.

Features

• 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.

Specifications

• 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 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): 21.7 x 20.6 x 5 cm
• Weight: 1.8 kg

Included

• 1 x OOR Analogue Headphone Amplifier.
• 1 x Mains Power Cable.
• 1 x Documentation.

More Information

• OOR, by Ferrum Audio