audiolab DC Block 6 Direct Current Blocker - Black

One Box Takes the DC Off Your Whole Rack

The Audiolab DC Block 6 is a six-outlet mains filter and DC blocker. One cord runs from the wall to the box. Up to six components plug into it, so a whole rack gets the same clean feed.

Audiolab describes “DC on the mains” as a common problem. Mains power should be a symmetrical sine wave. Dimmer switches, kitchen appliances and computer power supplies use that wave unevenly, and a DC voltage ends up riding on the line.

Audiolab says less than 500mV of DC, typical in an average home, can saturate the toroidal transformers found in many amplifiers. The result can be audible mechanical vibration from the chassis.

Two Jobs, Six Outlets, Cables Included

The DC Block 6 blocks DC of up to 1.2V (1200mV) and rebalances the mains sine wave. A high-frequency filter then works on noise. It addresses both differential-mode noise, which cheap switch-mode supplies make worse, and common-mode noise from phones, Wi-Fi and Bluetooth.

Load ratings are 8 amps for each outlet and 10 amps for the whole unit. Overload protection is built in. Power can be anywhere from 100V to 240V at 50 or 60Hz.

A full set of cables ships in the box. You get six IEC C13-to-C14 cables for your components and one power cord for the wall. The aluminum case is 444mm (about 17.5 inches) wide, weighs 4.6kg (about 10 pounds) and comes in black or silver.

On the front, an OLED voltmeter shows the measured mains voltage, so you can see what your wall is delivering. Switch it off if it distracts you during a listening session.

Who Is This DC Blocker Best For?

• Your amplifier hums from inside the chassis. — The DC Block 6 blocks the DC offset that can saturate a toroidal transformer, so the buzz can stop at its source
• You want one fix for the whole rack. — Six outlets treat an amp, preamp, DAC, streamer and more together, without a separate blocker for every cord
• You live with dimmers, appliances and shared circuits. — Those loads are the usual sources of DC offset, and the DC Block 6 sits between them and your gear
• You would rather not buy cables. — Six IEC cables and a power cord are in the box, so setup takes one sitting
• You expect surge protection too. — The DC Block 6 blocks DC and filters noise, and Audiolab lists overload protection rather than surge protection. For spike defense, add one of our power conditioners

How Does It Connect to Your System?

Plug the supplied power cord into the wall and into the DC Block 6. Then link each component with one of the six IEC cables. Every cable runs from an outlet on the DC Block 6 to the power inlet on that component.

Keep the total draw within 10 amps, and under 8 amps on any single outlet. Then power up and read the front voltmeter.

Plug in, power up, done.

Pairs Well With

Building your system? Here are some great companions for the Audiolab DC Block 6:

• Power cables if you want to move beyond the cables in the box
• Power conditioners to add the surge protection the DC Block 6 does not provide
• Stereo amplifiers with large transformers that benefit from DC-free mains
• Audio racks with shelves wide enough for a 444mm chassis

Frequently Asked Questions

How do I know if I have DC on my mains?

Audiolab says DC offset can cause audible mechanical vibration in an amplifier’s toroidal transformer. Listen for a buzz from the chassis itself, not the speakers. A buzz that comes from the speakers usually has another cause, such as a ground loop.

How many components can I plug into it?

Six, one per outlet. Each outlet is rated for 8 amps, and the whole unit is rated for 10 amps. Add up your components’ draw before you fill every outlet.

What is in the box?

The DC Block 6, six IEC C13-to-C14 cables and one power cord. It is ready to connect as soon as it arrives.

Does it have a display?

Yes. An OLED voltmeter on the front shows the measured mains voltage. You can switch it off if you prefer a dark rack.

Does the DC Block 6 protect against power surges?

It is built to block DC and filter RFI and EMI. Audiolab lists overload protection among its features. For surge defense, pair it with one of our power conditioners.

What is the warranty?

Audiolab’s warranty is three years if you register within 90 days of purchase, otherwise one year or your country’s longer statutory period. It is for the original owner, bought new from an authorized Audiolab dealer, and is not transferable or valid outside the country of purchase.

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Learn More

Want to learn more about DC offset, toroidal transformer hum, or cleaning up your AC power? Visit our Learning Center for guides, tips, and expert advice.