iFi DC Blocker+ – Blocking DC Current

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

The iFi DC Blocker+ from the SilentPower line by the British manufacturer is an intelligent device that, when placed at the IEC power input (the rear power socket), prevents DC current from entering the amplifier, eliminating the annoying transformer hum. Thanks to the DC Blocker+, you can finally enjoy a disturbance-free listening experience, fully immersing yourself in the music.

The Role of Household Power in Audio Systems

Household electricity, a fundamental element for audio systems, is often subject to various interferences that distort the AC waveform, compromising audio quality. One of the most common problems, especially with amplifiers, is the presence of DC current on the electrical grid.

Although household sockets are supposed to provide pure alternating current (AC), several household appliances—from lighting controls to power supplies—create asymmetric loads, which can lead to DC voltage appearing on the AC network.

How the iFi DC Blocker+ Works

When even a small amount of DC voltage reaches the amplifier’s transformer, it can cause saturation, leading to a significant and persistent hum. This hum is easily noticeable by placing your ear near the amplifier’s chassis, especially in high-powered amplifiers equipped with large toroidal transformers, such as those from Hegel.

This is where the iFi DC Blocker+ comes into play.

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 completely blocks DC interference, ensuring a clean and 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 featuring large toroidal transformers, which are particularly sensitive to DC voltage.

Key Features

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

How to Use

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

Conclusion

The DC Blocker+ is the perfect solution for those who seek a disturbance-free listening experience while protecting their amplifier from potential damage caused by DC voltage.