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The SPDIF iPurifier from iFi Audio is partly a nod to past SPDIF devices, including the Genesis Digital Lens. With the very latest iFi technology from Abbingdon Music Research (AMR), the SPDIF iPurifier is suited to the gamut of SPDIF sources that are on the market today.
From Apple TV to Google Chromecast to PS4/Xbox to 4K Smart TVs, SPDIF is the main digital audio output. As with all mainstream products, the critical SPDIF signal transmitted is of fairly low quality. The SPDIF iPurifier runs the SPDIF signal through four comprehensive stages. The result is a fully-restored, perfect SPDIF with jitter eliminated. You are treated to sound quality that has greater warmth, resolution, and dynamic contrast.
"iFi SPDIF iPurifier brings everything into a sharper focus with better shape, definition and clarity," reports reviewer highfell, head-fi.org. "It's the most competitive coaxial or optical 'data cleaner' in the market… the SPDIF iPurifier noticeably delivers. For me it's a keeper."
Putting the Square Back in Square Wave
The signal from SPDIF devices is a digital signal. The industry standard for looking at the quality of a digital signal is to search for the 'square wave' on an oscilloscope. But the wave is anything but 'square', resembling more of a jagged wave, due to jitter and other factors. The SPDIF iPurifier takes any barely recognizable 'square wave' and with REclock and Regenerate technologies, the signal is back to a real-world, perfect waveform
Bit-Perfect Audio on All Fronts
iFi Audio prides itself in assuring Bit-Perfect signal transfer. This means the signal remains original and unchanged. The SPDIF iPurifier ensures a Bit-Perfect transfer, which is highly unusual for SPDIF devices. It can handle 44.1, 48, 88.2, 96, 176.4, and 192 kHz, 16 to 24 Bit, DSD/DoP, and even Dolby Digital and DTS.
On the connectivity front, the SPDIF iPurifier has a coaxial / optical input and a coaxial / optical output. It works with just about any and every SPDIF product, from mass market Apple TV to an audiophile transport / DAC.
One of the key aspects of SPDIF iPurifier is that it has galvanic isolation, a feature that is showing up more and more on high quality streaming products. But galvanic isolation has to be done correctly in order to be beneficial, and iFi does it right using advanced circuitry. Galvanic isolation, in fact, is a major factor behind the SPDIF iPurifier's ability to stop spurious noise from contaminating the signal.
Global Master Timing + Memory Buffer
AMR's Global Master Timing (GMT)/ Memory Buffer System represents a total 'out of the box' systematic digital solution that solves the digital SPDIF jitter issue once and for all. The Intelligent Memory System holds a large number of complete audio samples, so it may completely absorb a large amount of variation (jitter and drift) in the incoming signal, while still sending out data at a fixed and precise clock rate, regardless of variations in the incoming clock.
Central to the GMT clock system is an ultra-low jitter, quartz-driven clock system (<300 femto second crystal) capable of producing millions of different frequencies with a precision of better than 0.001Hz. Hence, if the frequency shifts from 192,000.002 Hz to 192,000.003 Hz over a period of minutes (drift), which is the minimum amount of shift to be meaningful, the GMT clock will intelligently and precisely track the change. This is a core technology of the SPDIF iPurifier.
iPower 'Quieter Than Battery' Technology
As the SPDIF iPurifier is powered by 5V, it is essential that it is fed by a silent power supply. Therefore each and every SPDIF iPurifier is shipped with its own iPower (5V) unit. With a noise floor of only 1uV, the iPower is a unique breed of near-silent DC-power supply. Low power consumption and low-noise are the hallmarks of this 'quieter than battery' power supply.
Packed to the Brim with Technology
With a bill of materials that stands at 53 individual components, beneath its unassuming exterior, the SPDIF iPurifier has two separate PCBs. Each PCB is mil-spec'd and packed to the brim with advanced technology.