iFi DC Blocker – Eliminate Transformer Hum

The iFi DC Blocker resolves the hum issue in audio systems.

The iFi DC Blocker from the SilentPower line, produced by the British manufacturer, is an intelligent device placed at the IEC power input (the rear power socket). It prevents DC current from entering the amplifier, effectively eliminating the annoying transformer hum. With the DC Blocker, you can finally enjoy an interference-free listening experience, fully immersing yourself in the music.

The Role of Household Power in Audio Systems

Household electricity, a crucial element for audio systems, is often subject to various kinds of interference that distort the AC waveform, compromising sound quality. One of the most common issues, especially with amplifiers, is the presence of DC current on the power grid.

Although household sockets should provide pure alternating current (AC), a variety of appliances—such as lighting controls and power supplies for household devices—can create asymmetric loads, leading to DC voltage appearing on the AC network.

iFi DC Blocker in Action

When a small amount of DC voltage reaches the amplifier’s transformer, it can cause saturation, generating a significant and persistent hum. This hum is easily perceptible when placing your ear near the amplifier’s chassis, particularly in high-power amplifiers equipped with large toroidal transformers, such as those from Hegel.

This is where the iFi DC Blocker comes in.

The DC Blocker is a smart device designed to eliminate transformer hum in power amplifiers. Positioned at the IEC power input, it intercepts and neutralizes DC voltage before it reaches the amplifier, protecting it from potential damage.

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

Key Features of the iFi DC Blocker:

• Compact Design: Easily fits into an audio system without interfering with other connectors or cables.
• Safety: Preserves EMI shielding of the equipment without compromising its security.
• Effectiveness: Blocks over 1000mV of DC, completely eliminating transformer hum.
• Versatility: Globally compatible (90-250V).

How to Use:

1. Connect the male IEC plug of the DC Blocker to the power input of the device.
2. Insert the original IEC power cable of the device into the female connection of the DC Blocker.

In summary, the DC Blocker is the perfect solution for those seeking an interference-free listening experience while protecting their amplifier from potential damage caused by DC voltage.