iFi Audio
DC iPurifier2

Active Noise Cancellation® – Fighter Jet tech to down DC noise

Got SMPS? Just add the DC iPurifier. Generic Switch Mode Power Supply designs are noisy – but they were only intended for mainstream use so noise was never a consideration. Just insert the DC iPurifier between the existing noisy power supply and the source; noise is reduced by a factor of 316X to 100,000X. Be it home or professional audio, this is the most simple and most effective way of improving audio performance from arguably, one of the most noisy sources in a computer audio system.

With trickle down technology from Abbingdon Music Research (AMR), the very latest product from iFi is the DC iPurifier; a noise cancellation product aimed to enhance the existing, ubiquitous Switch Mode Power Supply (SMPS). Generic SMPS designs are very noisy because they were never intended for audiophile applications.

The Active Noise Cancellation® derived from military radar technology. Drawing from the military field (specifically the Thales Spectra radar cancellation system deployed in the French Dassault Rafale jet fighter), iFi adapted this technology to exclusively introduce the Active Noise Cancellation® (ANC®) for audio power systems. An enemy air defence radar will transmit at a certain frequency; when the enemy signal reaches the aircraft, a receiver on board the aircraft will pick up the signal and a computer will analyse its base frequency/modulations and produce an identical, but out-of-phase signal to cancel the enemy radar signal.

By generating a signal identical to the noise signal but in the exact opposite phase, it actively cancels all the incoming noise. ANC® is the perfect ‘antidote’ for power supply noise, the bane of all audio systems. Across the audible range, measured noise is attenuated by 316X to 100,000X or by 50 dB to 100 dB respectively.

Sonically, the background and inner resolution to recordings is brought to the fore and no longer hidden. Sonics are much smoother, just like how good analogue should be. Nothing comes close.

The DC iPurifier handles 5 V through to 24 V. Takes up to 3.5 A or 84 W. For different types of DC barrel connectors, the DC iPurifier works with 5.5 x 2.1 mm but also ships with adapters for 5.5×2.5 mm and 3.5×1.35 mm. These three fittings cover the gamut of DC barrel connectors.

Red protection LED will be lit if the input polarity is reversed (If reversed polarity, please correct). Professional audio applications typically require a ‘centre negative’ power supply. To lower noise with the DC iPurifier, use a ‘centre positive’ power supply at the input and use a special white ‘inverter’ at the output.