iFi Audio DC Blocker+ DC Offset Blocker

Enhance the quality of AC electricity for your audio and AV systems with the iFi Audio DC Blocker+. If you're experiencing mechanical hum, this device is your solution.

Sayonara Mechanical Hum

Mains electricity is crucial to your audio systems, but it can often be disrupted by various interferences that distort the AC waveform and reduce audio quality. One common issue, particularly with amplifiers, is 'DC on the mains'. Although household outlets are intended to deliver pure AC power, various home appliances—from lighting controls to power supplies—create ‘asymmetrical loads’, resulting in DC voltage on the AC supply.

When even a small amount of DC voltage reaches the transformer, it can cause ‘saturation’, leading the transformer to produce a significant and persistent humming sound. This hum is often noticeable when you bring your ear close to or next to the chassis.

The DC Blocker+ is a smart device that, when placed at the IEC (the rear power inlet), prevents DC from entering the amplifier, thus eliminating transformer hum.

iFi Audio DC Blocker+

Plus. Protect.

Enjoy music without the annoyance of unwanted hum.

• Intelligently blocks over 1,000mV DC to eliminate transformer hum.
• EMI shielding is retained, ensuring no interference with your audio quality.
• Equipment safety remains unaffected.

Plus for Higher Power Equipment

The bigger the amplifier, the larger the toroidal transformer, which is often more sensitive to residual DC voltage. Simply add the DC Blocker+ at the IEC to stop DC from getting in.

• Globally compatible (90-250V).
• Designed for high-power equipment with a continuous current rating of 10A.
• Compact design ensures it doesn’t obstruct other connectors, sockets, or cables.

Key Features:

• ZERO DC Block Technology: Stops DC from entering your amplifier, eliminating amplifier transformer hum.
• Designed for High-Power Equipment: Continuous current rating of 10A ensures compatibility with powerful audio systems.
• EMI Shielding Retained: Maintains the integrity of your audio system by preventing electromagnetic interference.
• High-Performance Components: Features a high-performance glass passivated semiconductor with a high-case dielectric strength of 1500VRMS, UL listed for safety.
• Flame Resistant Construction: The IEC socket, connector, and chassis are made of fireproof polymers (UL94-V0) for added safety.