IFI DC BLOCKER

Ifi DC Blocker (Standard and Plus versions) is a compact device that plugs directly into the IEC power socket of your audio component. Its main function is to block direct current (DC) before it reaches the transformer. In this way, the main cause of mechanical hum is eliminated, ensuring cleaner and noise-free listening and extending the life of the transformer itself.

iFi DC BLocker Solves the Hum Problem in Audio Systems

iFi DC Blocker from the SilentPower line of the English manufacturer is an intelligent device that, positioned on the IEC input (the rear power socket), prevents DC current from entering the amplifier, eliminating the annoying hum of the transformer. Thanks to the DC Blocker, you can finally enjoy a noise-free listening, completely immersing yourself in the music.

Home electrical power, the foundation of audio systems, can often be subject to various types of interference that distort the AC waveform, compromising audio quality. One of the most common problems, especially with amplifiers, is the presence of direct current (DC) on the mains.

While household outlets should provide pure alternating current (AC), a variety of appliances, from lighting controls to household appliance power supplies, create “unbalanced loads,” which can lead to the presence of DC voltage on the AC grid.

When a small amount of DC voltage from the mains reaches the amplifier's transformer, it can cause it to "saturate", generating a significant and persistent hum. This hum can be easily heard by placing your ear close to the amplifier chassis, especially in more powerful amplifiers equipped with large toroidal transformers such as Hegels.

And this is where our iFi DC Blocker comes into play.

The DC Blocker+ is a clever device designed to eliminate annoying transformer hum in power amplifiers. Placed on the IEC power input, it intercepts and neutralizes the DC voltage before it reaches the amplifier, protecting it from potential damage.

Thanks to ZERO DC Block technology, the device completely blocks DC, ensuring noise-free listening. Designed to handle high-power equipment (rated DC current: 10A), the DC Blocker+ is compatible with a wide range of amplifiers, including those with large toroidal transformers that are particularly sensitive to DC voltage.

Its main features include:

Compactness: The compact design allows for easy insertion into your audio system without cluttering up other connectors or cables.

Safety: Keeps the EMI shielding of the equipment intact and does not compromise its safety.

Efficacy: Effectively blocks over 1000mV of DC, completely eliminating transformer hum.

Versatility: Globally compatible (90-250V).

How to use:

Connect the male IEC connector of the DC Blocker+ to the power input of the device.

Insert the original IEC power cable of the device into the female connection of the DC Blocker+.

In summary, the DC Blocker+ is the ideal solution for those who want noise-free listening and want to protect their amplifier from potential damage caused by direct voltage.

TECHNICAL SPECIFICATIONS

DC BLOCKER

ZERO DC Block technology: Blocks incoming DC – up to 1,200mV

Voltage rating: 90 – 240 volts

Maximum current rating: > 7A

Max amplifier power​: 880W or VA on 220v / 440W or VA on 110v

Continuous current rating: 4A

Universal IEC: Hospital-grade IEC connectors

Dimensions: 68 x 37 x 32 mm

Weight: 63g

DC BLOCKER+

Input/Output: Universal IEC

ZERO DC Block Technology: Block Incoming DC (Up to 1,200mV)

Voltage Rating: 90-250V

Connectors: Hospital-grade IEC Connectors

Maximum current rating: ≤14A

Continuous current rating: 10A

Max amplifier power: 2200W or VA on 220V ~​1100W or VA on 110V ~​

Net Weight: 80g (2.8oz)