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Home News

Cyrus 40 ST Streaming DAC

Marco Lisi by Marco Lisi
July 13, 2026
in News, Digital sources
Reading Time: 3 mins read

Cyrus Audio, a British hi-fi stalwart renowned for its precision engineering, has launched the Cyrus 40 ST, a state-of-the-art network streamer designed to elevate digital music playback to audiophile standards. Powered by the acclaimed BluOS streaming platform and housed in the sleek aluminum chassis of the 40 Series, the 40 ST promises pristine sound quality, seamless connectivity, and intuitive control for discerning music lovers.

  • Cutting-Edge Digital Performance
  • Seamless Control with BluOS
  • Connectivity and Versatility
  • Enhanced Power Option
  • Design and Build
  • A New Benchmark for Streaming

Cutting-Edge Digital Performance

At the heart of the 40 ST lies a custom-designed digital-to-analog converter (DAC) based on the ESS Sabre ES9039Q2Mchipset with HyperStream IV Dual DAC technology. Supporting high-resolution audio up to 24-bit/192kHz, the DAC has been meticulously optimized by Cyrus’s engineering team to deliver exceptional clarity and fidelity. Every component and board layout has been fine-tuned to extract the highest possible performance, making the 40 ST a standout in Cyrus’s digital product lineup.

The 40 ST is not just about raw specs—it’s about delivering a bit-perfect listening experience. With support for MQA decoding, Roon Ready certification, and AirPlay 2, it caters to a wide range of streaming preferences. Whether you’re accessing music from your personal library on a network drive or streaming from over 20 natively integrated services like Tidal, Spotify, or Qobuz via the BluOS app, the 40 ST ensures lightning-fast, lag-free performance with zero loss in sound quality.

Seamless Control with BluOS

The BluOS Controller app, available for iOS, Android, Kindle, Mac, and PC, is the command center for the 40 ST. Its intuitive interface allows users to effortlessly browse millions of songs, tune into thousands of global internet radio stations, or dive into podcasts. The app also supports multi-room playback, letting you group multiple BluOS-enabled devices for synchronized audio throughout your home or play different tracks in separate rooms. For Apple users, AirPlay 2 integration adds further flexibility, enabling Siri-controlled playback across compatible devices.

cyrus-40st-streaming-dac-2

The 40 ST also ships with a new Cyrus remote, but the BluOS app remains the primary control hub, offering a modern, user-friendly experience. For those needing assistance, BluOS provides comprehensive support articles to ensure smooth operation.

Connectivity and Versatility

The 40 ST is equipped with a robust array of inputs and outputs, including:

  • 2 x Line Level Analogue Outputs

  • 1 x Digital Coax Input/Output

  • 1 x Digital Optical Input/Output

  • USB-A Socket for local music playback

  • RJ45 Ethernet and Wi-Fi 5 (802.11ac, 2.4/5GHz) for network connectivity

cyrus-40st-streaming-dac-3

This versatility ensures compatibility with a variety of audio setups, from traditional hi-fi systems to modern networked environments. The inclusion of GigE 1Gbps Ethernet guarantees stable, high-speed streaming, while the built-in Wi-Fi antenna offers wireless convenience without compromising performance.

Enhanced Power Option

Like other products in the 40 Series, the 40 ST supports the optional 40 PSU external power supply, connected via a 15-pin cable. This dedicated power unit features an on-board microprocessor that communicates with the streamer to deliver stable, noise-free voltage across multiple output levels, further enhancing audio performance.

Design and Build

Encased in the elegant, compact aluminum chassis of the 40 Series, the 40 ST measures 88 x 220 x 385 mm and weighs 4.8 kg. Its minimalist design exudes sophistication, blending seamlessly into any high-end audio setup while maintaining the durability and quality Cyrus is known for.

A New Benchmark for Streaming

The Cyrus 40 ST sets a new standard for network streamers, combining cutting-edge DAC technology, robust connectivity, and the intuitive BluOS platform in a sleek package. Whether you’re a Roon enthusiast, an AirPlay user, or simply seeking the best way to stream your digital music collection, the 40 ST delivers uncompromising performance.

cyrus-40st-streaming-dac-4

For audiophiles looking to future-proof their systems, the 40 ST is a compelling choice that marries innovation with Cyrus’s decades-long legacy of audio excellence. Visit Cyrus Audio’s website or BluOS’s support pages for more details on this remarkable streamer.

Tags: CyrusNetwork Music Player
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Marco Lisi

Marco Lisi

Publisher

Marco Lisi is the publisher of Best of High End, part of AV Concepts BV. His path into audio started early: as a teenager he was drawn into the world of free radio, presenting shows and living immersed in music every day. In his early twenties he ran his own production studio for five years, creating jingles and commercials — hands-on training in sound design, pro-audio workflows, and critical listening through studio monitors that still shapes how he evaluates gear today. He also spent years DJing in clubs before moving into publishing, first at two earlier online magazines before founding Best of High End. His hi-fi and home cinema passion was inherited from his father, an inveterate system-swapper. Marco's first setup — a confirmation gift — paired AKAI separates with entry-level Bowers & Wilkins speakers, a brand he stayed loyal to for years as his system grew from stereo into full surround and home cinema. Like many enthusiasts, he went through an extended "audiophile" phase chasing the next upgrade, before settling into a more grounded view: gear as a means to enjoy music and film, not an end in itself. Years of critical listening have given him a well-trained ear — the ability to characterize a system or pinpoint a change in the chain quickly and accurately. Just as important, his teaching background (a Belgian "regent" degree in Dutch language) gives him the tools to translate those listening impressions into clear, readable writing.

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