Mains filter & DC blocker • blocks up to 1.2V DC offset • high-frequency RFI/EMI filtering • 8A maximum load • overload protection • compact single-component power optimization
The Audiolab DC Block Direct Current Blocker is designed to improve the quality of the AC power feeding a single Hi-Fi or AV component by addressing two common sources of electrical contamination: DC offset and high-frequency mains noise. DC voltage present on household AC can cause the toroidal transformers commonly used in high-performance amplifiers and audio components to become partially saturated, potentially resulting in mechanical vibration and compromised power-supply performance.
By blocking up to 1.2 volts of DC offset and incorporating a high-performance mains filtering circuit, the DC Block helps restore a more balanced AC waveform while reducing RFI and EMI contamination. Its compact, single-component design makes it a practical addition to an integrated amplifier, power amplifier, source component, or other compatible piece of audio equipment.
Key Features & Innovations
Blocks up to 1.2V of DC offset — the Audiolab DC Block Direct Current Blocker is designed to cancel DC voltage riding on the AC mains supply, helping restore a more symmetrical power waveform before it reaches connected equipment.
Helps reduce transformer saturation — even relatively small amounts of DC on the mains can negatively affect large toroidal transformers. Removing the DC component can help reduce unwanted mechanical vibration and allow the transformer to operate under more appropriate conditions.
High-frequency mains filtering — integrated filtering is designed to suppress electrical contamination carried through household AC wiring before it reaches the connected audio or AV component.
RFI and EMI noise reduction — the filtering circuit addresses interference associated with switching power supplies, household electronics, wireless devices, Wi-Fi networks, Bluetooth, and other common noise sources.
Common-mode and differential-mode filtering — Audiolab's dual-action design targets multiple forms of electrical interference rather than addressing DC contamination alone.
8A maximum load capacity — substantial current capability allows the DC Block to be used with many compatible amplifiers, source components, and other Hi-Fi electronics.
Compact single-component design — one IEC input and output provide a straightforward way to add dedicated DC blocking and mains filtering to a critical component without requiring a larger multi-outlet power conditioner.
FAQ — Audiolab DC Block
What does the Audiolab DC Block do?
The DC Block removes DC offset from the incoming AC mains supply while also filtering high-frequency RFI and EMI contamination. Audiolab specifies that it can block up to 1.2 volts, or 1200mV, of DC offset.
Why is DC on the mains a problem for audio equipment?
DC voltage present on an AC power line can cause toroidal transformers to become partially saturated. This can result in audible mechanical vibration and may prevent the transformer's power supply from operating under ideal conditions.
Does the DC Block also filter electrical noise?
Yes. In addition to blocking DC offset, the unit incorporates high-frequency mains filtering intended to reduce both common-mode and differential-mode RFI and EMI contamination.
Can the Audiolab DC Block be used with an amplifier?
Yes, provided the connected component remains within the DC Block's 8-amp maximum load specification. It can be used with compatible integrated amplifiers, power amplifiers, source components, and other Hi-Fi or AV electronics.
What is the difference between the DC Block and DC Block 6?
The standard DC Block is designed for one component and provides a single IEC power path with an 8A maximum load. The Audiolab DC Block 6 is a larger six-output solution designed to provide DC blocking and mains filtering for multiple system components.
Why Buy From Us
Authorized Audiolab dealer offering 100% genuine products with full manufacturer warranty coverage
Expert advice on amplifier matching, AC power optimization, and complete Hi-Fi system design
Professional system installation and equipment integration services available
Dedicated customer support for setup, troubleshooting, and system optimization
Related & System Matches
Audiolab DC Block 6 six-way mains filter and DC blocker
Audiolab integrated amplifiers and power amplifiers
Audiolab CD transports, streamers, and DAC components
High-quality IEC power cables for Hi-Fi and AV systems
