Manley Laboratories Absolute® Headphone Amp
Manley’s Absolute Headphone Amp pairs holographic openness, deep bass authority and a grain-free top end with rare hands-on control. Switch between single-ended warmth and punchier push-pull drive, then fine-tune feedback and impedance for each headphone. HiFi News praised its neutrality and musicality, while Enjoy The Music found its imaging, extension and preamp performance exceptional.
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Nicely Roasted
Sound Quality
91/100
Build Quality
93/100
Features Usability
89/100
Value for Money
82/100
Pros
Delivers transparent, airy, holographic imaging with precise placement and a black background.
Switchable single-ended/push-pull operation, variable feedback and impedance matching provide genuinely useful tonal tailoring.
Combines substantial bass body and drive with a rich but unbloated tube midrange.
Doubles effectively as a stereo preamplifier, adding versatility to its premium build and feature set.
Cons
Best results require experimentation with impedance, topology and feedback; some headphone pairings are notably less successful.
Feedback settings can be finicky: too little was found woolly, while too much reduced immediacy and dynamic drive.
Premium pricing makes it a specialist luxury purchase rather than a straightforward all-purpose reference amp.
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What Reviewers Are Saying
SOUND QUALITY PERFORMANCE 91/100
Reviewers repeatedly praise an unusually open, detailed and highly musical presentation, with the ability to move between taut push-pull precision and richer single-ended bloom. Its extensive adjustment range is a genuine sonic strength, though finding the best combination of mode, feedback and impedance is important; one reviewer found it notably selective with certain headphone pairings.
Transparency Resolution
94/100
Positive Feedback hears audible layers and strong resolution, while Enjoy the Music describes details surfacing easily without distracting from the musical whole. HiFi News calls openness the amplifier's greatest virtue, and several reviewers praise its precise imaging and separation; Joshua Valour does find its treble less vivid than some solid-state alternatives with certain pairings.
Tonal Balance Musicality
95/100
HiFi News calls it the most neutral, open and musical headphone amplifier the reviewer had used, while Positive Feedback describes the sound as neutral, inviting, balanced and mellifluous. Single-ended operation can add intimacy, warmth and bloom, whereas push-pull offers a drier, more controlled alternative, letting owners tailor the character rather than imposing one fixed voicing.
Dynamics
93/100
Reviewers hear strong pace, punch and authority, from tauter and more impactful percussion in push-pull to exceptional bass body with the HE1000se. Headphone.Guru calls dynamics and speed top notch, but the feedback control needs sensible adjustment: too little was described as wild and woolly, while too much reduced immediacy and dynamic drive.
Noise Floor
88/100
Several reviewers characterize operation as extremely quiet, with Enjoy the Music specifically hearing a nicely black background and Audiophilepure comparing its quietness to solid-state. 6 Moons notes the published 83dB signal-to-noise figure may concern specification-focused buyers, but the supplied listening reports do not describe audible hiss or hum in normal use.
Headphone Compatibility
87/100
The front-panel impedance selector, selectable operating modes and feedback control helped reviewers obtain successful results with varied headphones, including Audeze LCD-XC, HiFiMAN HE1000se, Susvara, Abyss 1266 and Dan Clark models. It is not entirely plug-and-play: Joshua Valour found it a picky amplifier and disliked the results with HD800S, while other reviewers stress that the right settings and pairing are essential.
Assessments of Build Quality, Usability, and Overall Propositions.
Build Quality
93/100
Positive Feedback found the chassis solidly built with impeccable fit and finish, and describes it as built like a tank. Headphone.Guru cites the billet chassis and custom hand-wound output transformers, while reviewers also praise the soft-start implementation and distinctive, carefully finished presentation.
Features Usability
89/100
This is an exceptionally adjustable analogue amplifier: it offers switchable single-ended and push-pull modes, continuously variable feedback, three impedance settings, bypassable Baxandall bass and treble controls, balance, mono, mute, remote volume and preamp/bypass capability. Two RCA inputs, RCA line output, 6.35mm and 4-pin XLR headphone outputs make it versatile, although it has no built-in DAC or digital inputs, and the XLR headphone socket does not make it a fully balanced amplifier.
Value for Money
82/100
At roughly $4,500 originally and listed around $5,499-$5,799 currently, this is plainly a luxury purchase. Enjoy the Music finds the preamp capability makes the original price more palatable and Positive Feedback highlights unusual flexibility at the price, but Joshua Valour calls the cost ludicrous and recommends it only for a small group of well-resourced buyers with carefully chosen headphones.
Reviews & Sources
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Specifications
- Remote Control
- Remora RF remote control
- Power-up Sequence
- Soft Start, 30 second mute-controlled power-up sequence
- Mains Voltage
- 90-250 VAC, 50-60Hz, universal works worldwide
- Fuse
- 2A (T) 250V SLO-BLO located on MANLEY POWER® PCB
- Unit Dimensions
- 11.5 x 5.5 x 8.2” (LxWxH)
- Unit Weight
- 12 lbs
- Shipping Weight
- 13.5 lbs
- Packing Carton Dimensions
- 17 x 11 x 15”
- Power Consumption
- STANDBY mode = 0.5W, Max Power = 80W
- Heat Rise (Rear)
- 25ºC or 44ºF
- Heat Rise (Side)
- 15ºC or 26ºF
- Compatible Headphones
- HIFIMAN HE1000 original v1, HE1000v2, HE6se, Manley Absolute Headphone Amp Susvaras, Audeze LCD-4, FOCAL UTOPIA, Stellias, Dan Clark Audio (formerly Mr. Speakers) various IEMs from CARDAS, SHURE, ETYMOTICS
Manufacturer's Description — Manley Laboratories
The ultimate reference for headphone sound
- All-tube output stage with switchable Single-Ended and Push-Pull topologies
- Custom hand-wound Manley IRON® output transformers with switchable impedance matching
- Precision stepped relay ladder attenuator for channel accuracy
- Tonal control via Variable Feedback and shelving EQs
Manley Absolute - 3 decades of tube amplification expertise
The Manley Absolute headphone amp represents the culmination of over thirty years of vacuum tube design, engineered to deliver uncompromising performance for critical listening. This all-tube amplifier provides comprehensive control over sonic detail, allowing precise optimization for any headphone. Combining exceptional audio performance with a unique industrial design, the Absolute serves as both, a professional reference tool and a statement piece.
Switchable topologies for complete sonic flexibility
The Absolute offers selectable output tube configurations: Single-Ended topology emphasizing even-order harmonic content for rich, warm tonality, and Push-Pull topology delivering higher output power with controlled odd-order harmonics for dynamic precision. A continuously variable feedback control adjusts damping factor and transient response from tight, controlled bass to relaxed, open presentation, providing unprecedented command over the amplifier's sonic signature.
Optimized impedance matching for all headphone types
Custom hand-wound Manley IRON® output transformers feature a three-position impedance selector for optimal matching with any headphone. Selectable settings accommodate Low (12-50 Ohm), Mid (50-200 Ohm), and High (200-600 Ohm) impedance loads, ensuring maximum power transfer and exceptional transient accuracy across all driver types. Proper impedance matching delivers superior damping and dynamics regardless of headphone design.
Professional-grade control with versatile connectivity
Volume adjustment is achieved through a precision stepped relay ladder attenuator with half-dB resolution, providing perfect channel balance and accurate level recall. A defeatable Baxandall bass and treble shelving EQ offers gentle frequency contouring, while the center-detented balance control is fully bypassed at the center position. Dual headphone outputs—standard 1/4" TRS and 4-pin balanced XLR—plus RCA line-level outputs allow the Absolute to function as a premium preamplifier in any reference system.
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- 110Hz — online and in-store — Kielce, Województwo świętokrzyskie, Poland (website)
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