Key features

EISA Best Headphone Amplifier 2022–2023
Fully balanced, proprietary discrete power amplifier
Up to 8 W into 60 Ω balanced
130 dB dynamic range, THD below -119 dB
Balanced 4-pin XLR and 6.35 mm headphone outputs
Also works as a preamp with XLR and RCA line outputs
Three-knob simplicity
Upgradeable with HYPSOS

OOR – a star is born

OOR was chosen by EISA as the best headphone amplifier of 2022–2023. A ground-up design without precedent, it pairs understated looks with sophisticated power delivery and amplifier technologies, delivering ultra-low distortion, huge dynamics and unrivalled detail.

Perfected steering of the output transistors means they never switch off – keeping distortion inaudible and leaving them ready to unleash their full power instantly for superb dynamics, control and authority. The signal path stays truly balanced from the XLR inputs, and becomes truly balanced from the RCA inputs.

Made for HYPSOS

Performs beautifully straight out of the box, but can be taken further still when paired with the Ferrum HYPSOS hybrid power supply via the proprietary Ferrum Power Link (FPL) connection with 4-terminal voltage sensing.

Technical Specifications

Operation	Fully balanced, proprietary discrete power amp
Inputs	XLR, RCA
Headphone outputs	Balanced 4-pin XLR, unbalanced 6.35 mm
Line outputs	Balanced XLR, unbalanced RCA
Gain	Balanced -4 / +6 / +16 dB; unbalanced -10 / 0 / +10 dB
Output power (balanced)	1600 mW into 300 Ω; 8 W into 60 Ω
Output power (unbalanced)	400 mW into 300 Ω; 2 W into 60 Ω
Frequency response	20 Hz – 100 kHz ±0.1 dB
THD	<0.00011% / -119 dB (balanced); <0.00008% / -122 dB (unbalanced)
Dynamic range	130 dB (A-weighted)
Headphone output impedance	<0.3 Ω
Input impedance	94 kΩ
Power	Idle <15 W; 22–30 V DC adapter; FPL input
Dimensions (W×D×H)	21.7 × 20.6 × 5 cm
Weight	1.8 kg