WestminsterLab REI Class A Monoblock Pair 
Similar faces, smaller chassis. Perfection for all.  The Rei gives you a new perspective to Rediscover your Music
 
NOT THE TYPICAL CLASS A
Based on the legendary UNUM, the REI operates at Class A, with output all the way up to 400watt.
The Rei employs a WestminsterLab proprietary iBias and CCS systems, what it means in terms of electronically. The Rei will warm up much faster than other typical Class A amplifier, and the iBias technology constantly varies the bias depending on the current and also the loading of the amplifier. And the result sonically, is you get the best of the Class A without the typical draw backs. It is truly unique.
 
A new perspective in rediscovering your music
The development of the Rei begins when we realise how much people are loving the UNUM amplifier, and in order to show the joy and excitement we have to find new ways of bringing the technology of UNUM to a new more affordable body, it is one hell of a task especially as we set out to keep the essence and performance without cutting corners.
 
A new page in transistors matching
Matching transistors are not uncommon in the world of amplifier design and manufacture. But WestminsterLab do it very differently.
Not only the transistors are matched within 1%, the matching and paring are done across several working points of the curve and stress tested for hours to ensure the transistors are matched under extensive load. This is also one of the very reason why we can deliver 400 watts of Class A power in such a small package.
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Unique Mechanical Construction  |  Aerospace Grade 6063 Aluminium
Built Like No Others
Stability and rigidity of the whole amplifier is one of the key criteria to a outstanding amplifier. This is because under a stable environment, signals and power can go through a more stable, undisturbed flow. For that, the chassis must be very stable and rigid with very low resonance and vibration. 
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Rei’s concept of mechanical structure is completely different from UNUM, instead of just having one unibody like UNUM, the main load bearing chassis of the Rei amplifier is constructed with two very rigid CNC machined aerospace grade 6063 aluminium components. 
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Why two? Because we can separate the mechanical vibration between power supply components and the “amplifier” electronics. From our test, we realised the power supply has a micro-mechanical vibration at the power supply frequency and its harmonics, which is very different from other electronic components within the amplifier. And this unique construction media this phenomenon to the minimum.
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The exposed exterior panels of an amplifiers absorbs a lot of micro-vibration within the audio-band from the speakers. Hence these external panels of Rei are designed to have resonance as furthest away from the audio-band as possible and anchored to the power supply chassis, away from the delicate and sensitive audio electronics.
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Finite Thermal Simulation
Asymmetric Heatsink Design
One of the main components of the chassis where all the “amplifier” electronics are mounted on is the main heatsink. It is a very challenging components to engineer, as it has to function as a structure, means it has to have certain mechanical stiffness; it also has to function as a heatsink, which it must have a certain degree of exposure to the environment and this creates a problem as the sheer surface area, which is needed in order to function as a heatsink, can have a significant effect on the sound as it is a massive sound absorber,
 
That is the reason why the heatsink of Rei has a very unique asymmetric fins, which reduces the resonance effect, and the aperture of the heatsink is controlled by other body panels to make exposure to audio vibration as least as possible.
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It's all about POWER
The power supply design is one of the key elements in amplifier design. Lots of users or even manufactures completely underminds the importance of a capable power supply. Not only the power supply has to be low noise ( both voltage and current ), it has to be able to maintain those characters under loads. The speed that the power supply reacts with a sudden surge of load is also key to the intoxicating instant oomph that the Rei able to deliver.
 
Ultra thick PCB
The PCB is one of the key components within any amplifiers. It is the medium amongst different components, this network of complex copper connection can somehow be the weakest link within the equation if it is to be overlooked. After years of testing and countless prototypes with our supplier, we have nailed a certain type of PCB with ultra thick and ultra pure copper layer. In our own audition, it is pure, fast and transparent, it came very close to point to point soldering