Westminster Lab Rei
Westminster Lab Rei monoblocks deliver see-through transparency, lightning transient precision and an unusually neutral Class A voice. Robert Harley found their compact chassis drove every speaker tested with effortless, rhythmically propulsive authority, while combining finely resolved treble with weighty, articulate bass. Outstanding build quality and near-reference clarity make them a serious high-end contender.
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Deliciously Crispy
Sound Quality
94/100
Build Quality
93/100
Value for Money
94/100
Pros
Exceptionally transparent and finely resolved, with delicate treble detail and impressive midrange clarity.
Fast, powerful dynamics and transient precision drive demanding loudspeakers without apparent strain.
Bass combines warmth, tonal density and weight with clear pitch definition and rhythmic grip.
Compact, cool-running design with outstanding build quality and a short warm-up time.
Cons
Upper midrange and lower treble can sound more forward, with less pristine texture than the reviewer’s far costlier reference amplifiers.
Its neutral, incisive presentation will not suit listeners seeking a traditionally warm, soft-edged Class A sound.
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What Reviewers Are Saying
SOUND QUALITY PERFORMANCE 94/100
The Rei is described as unusually neutral, transparent and finely resolved for a Class A design, while retaining vivid musical energy and substantial bass weight. Its most distinctive strengths are transient speed, rhythmic vitality and the ability to drive demanding loudspeakers with ease; the main tonal caveat is a somewhat forward upper-midrange/lower-treble presentation.
Transparency Resolution
96/100
The reviewer calls the Rei extremely resolving and transparent, with precision and finesse that approach far costlier CH Precision reference amplifiers. Fine treble information, including the texture of delicate snare-brush work, is rendered with unusual delicacy rather than as a generalized high-frequency wash.
Tonal Balance Musicality
93/100
Rather than sounding conventionally warm or plump, the Rei is characterized as impressively neutral, clear and alive. Bass combines warmth, tonal density and weight with articulate pitch definition, though the midrange and lower treble are said to be somewhat more forward and less pristine in texture than the reviewer's much dearer references.
Dynamics
96/100
The Rei's dynamic verve, speed and impact are described as exceptional, especially given its compact form and rated output. Its transient precision brings visceral force to rhythmically complex music, and it reportedly drove every loudspeaker tried without apparent strain.
Soundstage Imaging
91/100
Percussion is described as emerging from blackness, with audible air around instruments and enough resolving power to reveal their material character. The reviewer also found that the amplifier conveyed a convincing sense of live, contemporaneous music-making, although there is less direct discussion of stage width and depth.
Assessments of Build Quality, Usability, and Overall Propositions.
Build Quality
93/100
The review explicitly describes build quality as outstanding. The compact monoblock implementation provides balanced XLR input and output, supports bridged operation, and its specified power doubling from 8 to 2 ohms indicates an amplifier engineered to remain capable into more demanding loads.
Value for Money
94/100
At $32,900, the Rei is a costly amplifier, but the reviewer found its midrange clarity and transparency close to six-times-more-expensive CH Precision M10 reference amplifiers. That comparison presents the Rei as a notably compelling high-end alternative for listeners seeking near-reference resolution without entering the very highest price bracket.
Reviews & Sources
Professional reviews and sources for this product's Watt'n Potatoes analysis.
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Specifications
- Power
- 100 watts @ 8Ω 200 watts @ 4Ω 400 watts @ 2Ω
- Power ( Bridged )
- 400 watts @ 8Ω 800 watts @ 4Ω
- Frequency Response
- 5 Hz to 40 kHz, ±0.1 dB 2Hz to 52 kHz, -1 dB
- Distortion
- (100 watts @ 8Ω) <0.1% @ 1 kHz
- Signal-to-Noise Ratio
- 104 dB, A-weighted
- Input
- 1 balanced XLR input
- Output
- 1 balanced XLR output
- Input Impedance
- 200 kΩ
- Output Impedance
- 0.018Ω
- Dimensions
- W232 x H112 x D320 mm
- Weight
- 16KG
Manufacturer's Description — Westminster Lab
A new persepctive in rediscovering your music
The development of the Rei amplifier began when we realized the overwhelming love and admiration people had for the UNUM amplifier. Witnessing the joy and excitement it brought to enthusiasts, we embarked on the formidable task of creating a new iteration that would be more accessible in terms of affordability, while preserving the essence and uncompromising performance that made UNUM exceptional. Our goal was to bring the cutting-edge technology and sonic experience of UNUM to a wider audience. With unwavering dedication, we approached this endeavor, meticulously designing and engineering every aspect of the Rei amplifier. We left no stone unturned in our pursuit of excellence, ensuring that the Rei delivers the same exceptional performance, musicality, and immersive experience as its predecessor, while being accessible to a broader range of users.
No compromises were made in our relentless pursuit of perfection. From the initial concept to the final product, we remained committed to delivering uncompromising audio quality, meticulous craftsmanship, and exceptional value. By leveraging our expertise and pushing the boundaries of innovation, we successfully created the Rei amplifier as a testament to our unwavering commitment. With the Rei, we aim to enrich the lives of more music lovers by offering a high-performance amplifier that surpasses expectations and captivates the senses. It is our firm belief that everyone deserves to experience the transformative power of music, and the Rei amplifier is our way of bringing that extraordinary experience to a wider audience.
NO ORDINARY CLASS A
Based on the legendary UNUM, the REI is operating at Class A, with output all the way up to 400watt.
Not The Typical Class A
The Rei amplifier distinguishes itself through the implementation of WestminsterLab's proprietary iBias and CCS systems, which have significant electronic implications. With these technologies, the Rei achieves a notably faster warm-up time compared to typical Class A amplifiers. The iBias technology dynamically adjusts the bias, taking into account the current and load of the amplifier.
This innovative approach enables the Rei to deliver the coveted benefits of Class A amplification without the typical drawbacks. Its ability to maintain optimal performance while mitigating issues associated with heat generation and power consumption makes the Rei truly exceptional. Prepare to experience a unique sonic journey, where the Rei combines cutting-edge technology with unparalleled sound quality, surpassing expectations in every way.
A new page in transistors matching
Matching transistors is a well-known practice in amplifier design and manufacturing, but WestminsterLab takes a distinctly different approach. Going beyond the norm, not only are the transistors meticulously matched within an impressive 1% tolerance, but the matching and pairing process extends across multiple working points of the curve.
To ensure utmost reliability and performance, these matched transistors are rigorously stress-tested for hours under extensive loads. This meticulous testing and matching methodology is one of the key reasons why the Rei amplifier can deliver an astounding 400 watts of Class A power in such a compact package. WestminsterLab's commitment to precision and attention to detail sets their amplifiers apart, guaranteeing exceptional quality and sonic excellence.
Power, Power and Power
The power supply design is an often underestimated, yet fundamental aspect of amplifier design. Sadly, many users and even manufacturers fail to fully grasp its significance. A capable power supply plays a crucial role, encompassing various critical functions. Beyond providing low-noise voltage and current, it must also maintain these essential characteristics consistently, even under demanding load conditions. Equally important is the power supply's agility in swiftly responding to sudden load surges.
This instantaneous responsiveness is the key to unlocking the Rei amplifier's intoxicating oomph and captivating power delivery. By meticulously engineering the power supply to excel in noise reduction, load stability, and rapid load adaptation, we have created an amplifier that delivers exceptional audio performance, enabling you to experience the full depth and impact of your favorite music with unrivaled clarity and precision.
Ultra thick PCB
The PCB (Printed Circuit Board) is an indispensable component within amplifiers, serving as a critical medium that facilitates connections between various components. If overlooked, it can become the weakest link in the entire system. Years of meticulous testing and countless prototypes with our dedicated supplier have led us to discover the ideal PCB design featuring an ultra-thick and ultra-pure copper layer. This carefully crafted PCB has proven to be a game-changer, showcasing exceptional qualities in our extensive auditions.
"Its purity, speed, and transparency in signal transmission come remarkably close to the unparalleled performance of traditional point-to-point soldering. With this meticulously engineered PCB, we have achieved a level of excellence that ensures optimal audio fidelity, enabling the Rei amplifier to deliver an immersive and transparent sound experience that surpasses expectations.
Verified Dealers
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Authorized dealers for Westminster Lab Rei
- The Audio Association — in-store — Anaheim, California, United States (website)
- 110Hz — online and in-store — Kielce, Województwo świętokrzyskie, Poland (website)
- Audio Lust — online and in-store — Mönchengladbach Ost, Nordrhein-Westfalen, Germany (website)
- Audio88 — in-store — Singapore, Singapore (website)
- coast sonic — online and in-store — Carlsbad, California, United States (website)
- DiokAudio — online and in-store — Ostrava , Moravskoslezský kraj, Czech Republic (website)
- Hear This — in-store — Newport Beach, California, United States (website)
- Heartbeats + Headshells — in-store — Santa Fe, New Mexico, United States (website)
- IAD- International Audio Distribution — in-store — Mönchengladbach Ost, Nordrhein-Westfalen (website)
- New Life Audio Solutions — in-store — Queens, New York, United States (website)
and 3 more verified dealers