Servo Evolution: The Cyrus philosophy for reading CD has always been the same - read it once and read it accurately. The latest iteration of Cyrus SE technology in the CDi-XR does exactly this, streaming the data from the disc to the audio processing circuitry with precision and accuracy.
DAC Technology: The CDi-XR DAC design includes the highest specified Sabre DAC. This, partnered with a high-speed analogue stage with excellent dynamic range delivers exceptional noise and THD performance from the DAC stage.
Power supply design: Within a CD player is a complex mix of signals including fast digital audio, sensitive analogue audio, high current servo and system control. To minimise interaction between these circuit stages the power supply design of the CDi-XR is completely segmented. The digital control circuits run from a dedicated, high-efficiency supply, with other parts of the player powered from an over-specified linear power supply with toroidal transformer. Nine individual stage regulators smooth and distribute power within the player according to demand.
PSU-XR port: The CDi-XR includes a port for the new PSU-XR power supply upgrade. Thirty years ago Cyrus broke new ground with the introduction of the PSX-R, the first ever regulated power supply upgrade that automatically adapted to match perfectly the power requirements of any connected product. The PSUXR raises the bar by sourcing no less than five independent regulated supplies in a single box. For the CDi-XR four of the PSU-XR power supplies are employed. One pair to provide ultra-smooth power for the analogue audio circuitry, one for the current-hungry demands of the motors and one just to provide an ultra-stable supply for the PLL digital master clock circuit, reducing any power supply related jitter to a minimum.
Configurable options menu: A new menu system makes the CDi-XR customisable yet easy to set up. The tree-style navigation structure has display, time-out, and system configuration options. Menu settings are quick and simple to select.
TRANSPORT / SERVO
Several years ago, Cyrus invested heavily in developing our own in-house CD ‘Servo’ mechanism, our ‘Servo Evolution’. The design principle is to read as much information as possible from the disc itself first time, rather than having to rely on ‘re-reads’ or ‘error-correction’.
Whilst it is true that the data on a CD is stored in ‘1s and 0s’, the way it is read, picking up different frequencies of reflected light, has analogue elements to it. Therefore, precision engineering can improve performance. Off-the-shelf mechanisms produce significant ‘system noise’ when the stepper motors of the mechanism are required to be used during the error correction processes when the data was not picked up on the first pass. Our ‘Servo-Evolution’ system reduces these re-reads and corrections by around 20%, producing not only a cleaner data stream for the DAC, but significantly less noise induced in the analogue output stages.
Upgraded components along with intelligently designed circuits using ‘counter-current’ methodologies to reduce noise pickup are in evidence throughout the design.
The fundamental principle is that power starts at the ‘quietest’ part of the circuit, before flowing towards the ‘noiser’ sections. Less noise is therefore ‘carried’ or induced into the power paths, limiting the transmission of noise inside the product. Whilst this sounds logical, the application in practice is incredibly complex, and needs to be considered at a system-wide level. Even the geometric alignment of individual components has been optimized to facilitate the cleanest possible flow of power and musical signal.
The DAC has been housed on its own shielded section of the PCB, again to help contain noise transfer
SECOND GEN QXR DAC
The DAC in the CDi-XR is our own second-generation QXR DAC platform with a key notable difference in its implementation. As a DAC usually has to handle a multitude of possible resolutions and input paths, their design is always a slight compromise on the best possible configuration for any particular source. In the CDi-XR, however, we know exactly which resolution is going to be received (44.1kHz, 16bit) and the incoming signal path that data is going to travel. As a consequence, we are able to calibrate our QXR DAC with incredible precision. We are able to optimize, not just the inbound data path and the data conversion itself, but also the filtering stages of the DAC to render the finest analogue output possible.
INTERNAL POWER SUPPLY
The CDi-XR, like all products in the XR series, has had a complete overhaul of the power supplies to each circuit section. The power supplies are much stiffer and have enabled Cyrus engineers to get the remarkable SE engine to run even more quietly.