Cyrus 40 ST with 40 PSU Power Supply
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For those whose music is predominantly digital, the Cyrus 40 ST streaming music player is their highest-performing network streamer, crafted to deliver the ultimate audio experience.

BluOS
Powered by the intuitive BluOS hi-res streaming platform and encased in the elegant new 40 series aluminium chassis, this device ensures that your favourite music streams effortlessly at up to 24-bit/192kHz across your home network, with minimal lag and no loss in sound quality. Its sophisticated design and powerful features make it the ideal choice for music lovers seeking premium performance. The BluOS app provides seamless access to millions of songs, internet radio stations, and podcasts from around the globe. Whether stored on your smartphone, tablet, or computer, your entire music collection can be enjoyed anywhere in your home, with full integration into the BluOS ecosystem.
Roon Ready & MQA Decoding
The 40 ST is Roon Ready, integrating all your music effortlessly, regardless of where it is stored or streamed from. The player also supports MQA technology, delivering master-quality audio as intended by the artist. Its built-in MQA decoder ensures the highest fidelity from studio recordings to playback.
AirPlay 2 and Digital Inputs
With AirPlay 2, the 40 ST can sync across multiple rooms, allowing seamless music enjoyment throughout the house. Additionally, it features both optical and coaxial digital inputs, enabling external devices such as CD players or televisions to benefit from Cyrus' superior DAC technology.
Digital Performance
The 40 ST continues Cyrus' tradition of superior digital design. Featuring the ESS Sabre ES9039Q2M chipset and HyperStream IV Dual DAC technology, every component has been meticulously crafted and optimised to maximise performance. This streamer excels in delivering accurate and dynamic sound quality, ensuring a true high-fidelity experience.
40 Series Chassis
The new 40 series chassis reflects the premium nature of the 40 ST, with a sleek brushed and black anodised aluminium exterior. The 5-inch high-resolution full-colour TFT display, complemented by a toughened glass front panel and hidden capacitive touch controls, adds a modern and luxurious feel to the unit, providing both durability and aesthetic appeal.

It's all about Control
Packaged with the new Cyrus remote, the 40 ST is primarily controlled via the intuitive BluOS app, compatible with iOS, Android, Kindle, Mac, and PC. With access to over 20 integrated streaming services, global radio stations, and your own music library, the 40 ST offers a comprehensive and unmatched digital listening experience, all within its stylish new chassis.
Power Supply Upgrade
To enhance performance further, the 40 ST is compatible with the 40 PSU external power supply. With multiple supplies and digitally controlled output voltages, the 40 PSU ensures unparalleled stability and near-zero noise interference, resulting in a superior listening experience.
40 PSU
Cyrus has a long-standing tradition of designing external power supplies, dating back to the launch of the PSX in the 1980s. The Cyrus 40 PSU proudly upholds this legacy, embodying cutting-edge technology in an elegant, compact chassis. Equipped with its own on-board microprocessor, the 40 PSU seamlessly connects to all 40 series products, intelligently adjusting power configurations to deliver optimal performance across a full spectrum of voltage outputs.
Features
- Two fixed voltage power supplies intended to power sensitive, low-voltage analogue circuitry.
- Two variable voltage high-capacity power supplies designed to supply power to low or high consumption analogue circuitry.
- The variable power supplies also feature two unregulated voltage settings that can be applied to enhance the power supply for high consumption circuitry, such as power amplifiers.

A New Beginning
Housed in a sleek, brushed aluminium case, the 40 PSU exudes sophistication while delivering remarkable functionality. The 40 PSU features multiple digitally controlled power supplies, ensuring exceptional stability and near-silent operation. Its versatility is further enhanced by its compatibility with both the 40 series and PSU-XR models, providing added flexibility for current Cyrus product owners.

The 40 PSU contains five independent power supplies, routed through a multi-way umbilical cable to a connected 40 series component. These include a high-capacity logic supply for digital circuitry, two fixed voltage supplies for sensitive analogue components, and two variable high-capacity supplies for analogue circuits. The variable supplies also feature unregulated voltage settings for powering high-consumption circuits, such as power amplifiers, ensuring exceptional performance across all devices.
Specifications
| DAC: | ESS Sabre ES9039Q2M 32-bit |
| Line Level Analogue Outputs: | 2 x Line Level Analogue Outputs |
| Digital Coax Output: | 1 x Digital Coax Output |
| Digital Optical Output: | 1 x Digital Optical Output |
| Digital Coax Input: | 1 x Digital Coax Input |
| Digital Optical Input: | 1 x Digital Optical Input |
| PSU Compatibility: | 40 PSU Compatible |
| Wireless Antenna: | Built-in Wi-Fi Antenna |
| Ethernet Socket: | RJ45 Ethernet Socket for Wired Network |
| USB Socket: | USB-A Socket for Music Playback |
| Network Connectivity: | Ethernet (GigE 1Gbps), Wi-Fi 5 (802.11ac, 2.4/5GHz) |
| Size: (H x W x D) | 88 x 220 x 385 mm |
| Weight: | 4.8 kg |
| Warranty: | 5 Year Warranty |
40 PSU Specifications
| Low Voltage Supply - Standby Mode: | +5V DC |
| Low Voltage Supply - Operational: | +5V DC |
| Fixed Voltage Supply - Standby Mode: | 0V |
| Fixed Voltage Supply - Operational: | +24V DC |
| Variable Supply - Standby Mode: | 0V |
| Variable Supply - Regulated: | +10V to +45V DC |
| Variable Supply - Unregulated: | +45V or +56V DC |
| RJ45 Ethernet: | For Firmware Updates |
| Mini USB: | For Firmware Updates |
| Size: (H x W x D) | 88 x 220 x 365 mm |
| Weight: | 9.4kgs |
| Warranty: | 5 Years |
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