The MOON 820S is an external linear power supply designed to upgrade compatible MOON components. It is built to power up to two devices simultaneously, with independent rails for analogue and digital products. It emerged from long-term development focused on the purity of the supply voltage, which directly influences the sound quality of the connected unit.
The foundation of the design consists of two custom toroidal transformers — one for the analogue and one for the digital supply section. They feature lower magnetic, electrical and thermal losses, which improves energy transfer and reduces the regulation factor. The result is faster current delivery and better dynamics. After the rectifier stage, each rail features two special "pi" filters with a total capacitance of 40,000 µF (4 × 10,000 µF) and a dual choke of 2 × 20 mH, suppressing interference carried in from the mains.
Voltage regulation is handled by four stages of the proprietary M-R2S circuit in both the analogue and digital sections. This is a fully discrete solution in which a precise voltage reference controls an amplifier made up of several integrated circuits and transistors, instead of a single regulator chip. The DC voltage obtained in this way is exceptionally fast, accurate, voltage-stable and with a practically unmeasurable noise level.
The entire electronics are implemented on four-layer printed circuit boards with pure copper traces, which exhibit extremely low impedance and significantly shorten the signal paths. In practice, the combination of a low noise floor and stable power delivery translates into more legible detail, more precise instrument localisation and better controlled dynamics of the connected component. The package includes two 4-pin XLR cables for the analogue section and two 5-pin XLR cables for the digital section.
| AC Power Requirements | 120 V / 60 Hz alebo 240 V / 50 Hz |
|---|---|
| Power Consumption @ Idle | 25 W |
Based in Boucherville, Québec, Canada, Simaudio has been designing and handcrafting top-of-the-range MOON audio components since 1980. The brand is recognised worldwide for its uncompromising engineering precision, premium craftsmanship and ability to convey the absolute truth of music. Every MOON component is created with the aim of forging a lasting, emotional connection with music and providing long-term reliability, underlined by the option of an extended warranty of up to 10 years. With over 400 international awards to its name, MOON by Simaudio stands as a stalwart of the global audiophile world.
The brand’s current portfolio offers two perfectly thought-out paths into the world of high-end Hi-Fi systems. The Compass collection opens the door to urban elegance, integrated functionality, intuitive control and top-class performance in a more compact package. On the other hand, the flagship North collection represents the brand’s most ambitious expression of engineering artistry, offering exceptional range, dynamics, M-Connect architecture and an unrivalled level of sonic refinement. Whether it’s network streamers, D/A converters, preamplifiers or uncompromising power amplifiers, MOON delivers clarity, microdynamics and musicality without colouration.
Manufacturer information (GPSR)
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