iFi DC Blocker+

If you have a mechanical hum, deploy the DC Blocker+

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Enhances the quality of AC electricity for your audio and AV systems.

Mains electricity, crucial to your audio systems, can often be disrupted by various interferences, distorting the AC waveform, and reducing audio quality. ‘DC on the mains’ is a common problem, particularly with amplifiers.

Although household outlets are intended to deliver pure AC power, a range of your home appliances—from lighting controls to home appliances power supplies—create ‘asymmetrical loads’, resulting in DC voltage on the AC supply.

When a small amount of DC voltage from the mains reaches the transformer, it can cause ‘saturation’, leading the transformer to produce a significant and persistent humming sound. You can hear it when you bring your ear close to or next to the chassis.

The DC Blocker+ is a smart device that, when you place it at the IEC (the rear power inlet), prevents DC from getting into the amplifier, thus eliminating transformer hum.

  • ZERO DC Block technology – stops DC from getting into your amplifier and eliminates amplifier transformer hum.
  • Designed for high-power equipment (continuous current rating: 10A).
  • EMI shielding is retained.
  • High-performance glass passivated semiconductor. High-case dielectric strength of 1500VRMS. UL listed. Flame resistant IEC socket/connecter/chassis (Fireproof polymers UL94-V0).
ZERO DC Block technology Blocks incoming DC – up to 1,200mV
Voltage rating 90 – 250 volts
Maximum current rating ≤14A
Max amplifier power​ 2200W or VA on 220V ~​
1100W or VA on 110V ~​
Continuous current rating​ 10A
Universal IEC Hospital-grade IEC connectors
Dimensions 75 x 46 x 32 mm / 3.0” x 1.8” x 1.3”
Weight 80 g (2.8 oz)

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