IFi SilentPower DC Blocker, GND Defender plus Nova and SupaNova mains cables Debuts for AV products

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Meet the new SilentPower DC Blocker, GND Defender plus Nova and SupaNova mains cables
The all-new SilentPower range is iFi’s latest collection of specialised ‘audio enhancers’ and is designed specifically to deal with mains-related noise. The range consists of four products at launch: the DC Blocker, the GND Defender and a pair of IEC power cables called Nova and SupaNova. So let's get stuck in.
The DC Blocker's main objective is to eradicate ‘DC on the mains’ – a problem most of us are familiar with since it results in an irritating transformer hum. To backtrack a little: in theory, the electricity we draw from the sockets in our homes should be pure AC – a perfectly symmetrical sine wave alternating between positive and negative phases. However, life isn't perfect. This AC voltage is affected by small amounts of DC voltage (present in our mains supply for various and complex reasons) which can cause the AC waveform to become asymmetrical, an effect known as DC offset. The AC transformers commonly used in home audio equipment cannot tolerate the presence of significant levels of DC voltage without being compromised. Less than 500mV of DC – typical in an average household electricity supply – can be sufficient to cause toroidal transfers (the kind often found in amplifiers) to become saturated, which adversely affects sonic performance and may cause that audible mechanical hum.

Enter then, the DC Blocker. iFi states that it is capable of cancelling more than 1000mV of DC voltage, thereby correcting the DC offset and rebalancing the AC sinewave. Furthermore, it does this ‘intelligently’, adjusting its performance according to the level of DC detected.

iFi’s SilentPower range begins launching this month. The DC Blocker and GND Defender are available now, while the UK-plug versions of the Nova and SupaNova arrive in July. The DC Blocker is available for £129, the GND Defender costs £99, the Nova will be priced at £169 (1.8m cable) and the SupaNova will have an RRP of £349 (1.8m cable).

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