Cyrus 40 PSU External power supply

The performance of the power supply plays a central role in the sound quality of audio devices. With the 40 PSU, Cyrus has developed a device that not only embodies the minimalist and elegant design of the 40 Series in an aluminum housing, but also sets a new standard for the provision of clean and stable energy for the products in this series. By using its own microprocessor, the 40 PSU can communicate directly with the connected host product, thus ensuring the optimal configuration for almost noise-free power supply at all times. This digital control enables the 40 PSU to deliver several output voltages simultaneously, which leads to a significant improvement in sound quality.

Sound advantages through precise power supply

The 40 PSU is designed to support the internal power supply of the host product and maximize overall quality. This synergistic collaboration provides a significant increase in sound performance, which is noticeable differently depending on the connected product. The most important sound improvements are individually tailored to each compatible 40 Series product.

40 AMP: Perfection in Detail

When the 40 PSU is used with the Cyrus 40 AMP, the external power supply is at its full potential by providing the power amplifier with particularly clean energy. This has a direct impact on the precision of the amplified signal: the amplifier's main power supply is optimized so that the signal is traced more precisely. This makes musical details clearer and the overall sound more transparent. The music not only sounds more detailed, but also more controlled, which is particularly noticeable in demanding musical passages.

The 40 AMP's preamp also benefits from the use of the 40 PSU. As it is fully powered by the external power supply, a more stable and precise power supply is ensured, which in turn leads to greater sonic accuracy. At the same time, the internal power supply takes over the power supply of the DAC section. Since the internal power supply is relieved of load, it can provide the DAC with a more consistent and powerful supply. This double stabilization improves the performance of the DAC, resulting in even more precise and dynamic reproduction.

In extensive listening tests, Cyrus found significant improvements in sound: the use of the 40 PSU made the sound of the 40 AMP more weighty and authoritative, details were clearer and the attack of notes was sharper. There was also improved control over the sound development and more precise timing accuracy, which intensified the overall music experience.

40 CD: Improved jitter reduction and clear sound contours

The Cyrus 40 CD also benefits greatly from the 40 PSU. Here, the external power supply takes over the power supply of the master clock, which leads to a significant reduction in jitter. Jitter can cause disruptive effects such as inaccurate timing or distortion in digital audio sources. The improved supply of the master clock increases the clock accuracy, which leads to cleaner and more precise playback.

Another important aspect is the outsourcing of the power supply for the CD motors. These motors are often susceptible to noise as they have to constantly adjust their speed. With the 40 PSU, this noise-prone power supply is outsourced, which significantly improves the overall performance of the 40 CD. The reduction in electrical noise results in clearer, more interference-free music playback, with fine details even more clearly visible.

The 40 PSU also takes over the power supply for the analogue side of the DAC, while the digital side continues to be powered by the 40 CD's internal power supply. This separation of power supplies minimises the risk of noise transfer between the digital and analogue circuits and contributes to improved sound quality. The result is more precise bass control, sharper sound edges and an overall more precise spatial imaging of the music.

40 ST: More depth and a holographic soundstage

There is also a significant improvement in sound performance when using the 40 PSU with the Cyrus 40 ST. The external power supply takes over the power supply of the analogue side of the DAC and the BluOS network module, resulting in a more stable and cleaner power supply. This clean power supply noticeably influences the sound quality of the 40 ST by bringing out new details in the music and improving control over the dynamics of the playback.

Particularly noteworthy is the increased spatial depth achieved by the 40 PSU. The instruments and voices are more clearly separated from each other, creating a larger space around each element of the recording. This results in a particularly impressive, holographic soundstage that gives the listener the feeling of being in the middle of the music.

This level of detail and the extension of the sonic depth make the 40 PSU an indispensable companion to the 40 ST, especially for listeners looking for an intense and lively music reproduction. The clean and stable power supply ensures that the 40 ST can reach its full potential and presents the music in a way that captivates the listener.

By using the 40 PSU, Cyrus demonstrates how crucial an accurate and noise-free power supply is to the sonic performance of an audio system. The intelligent and versatile power distribution of the 40 PSU helps ensure that every connected 40 Series product reaches its sonic maximum and offers an exceptional listening experience.

TECHNICAL DATA

The 40 PSU has five independent power supplies. All five power outputs are routed to a connected 40 Series product via a multi-wire interconnect cable:

• A high-capacity logic supply for powering the digital circuitry of a connected 40 Series product.
  Two fixed voltage power supplies for sensitive, low-voltage analog circuits.
• Two high-capacity variable power supplies for powering low- or high-power analog circuits. The variable power supplies also have two unregulated voltage settings that can be used to boost the power supply in power-intensive circuits such as power amplifiers.
• Low voltage supply | Standby mode +5V DC
• Low voltage supply | Operating mode +5V DC
• Fixed voltage | Standby mode 0V
• Fixed voltage | Operating mode +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
• Dimensions (HxWxD): 88 x 220 x 365 mm
  (3.46” x 8.66” x 14.37”)
• Weight: 9.4 kg (21 lbs)