Admittedly, it's quite a basic circuit to filter it and I've obviously never auditioned this audiolab unit but if your transformer is affected by DC, which it almost certainly will be if you have a fridge, washing machine and dish washer on your home mains, and if this circuit is correct (which I'm sure it would be), it's not snake oil to suggest that it would work. It's physics. Prices valid in stores (all including VAT) until close of business on 29th November 2023. (Some of these web prices are cheaper than in-store, so please mention that you've seen these offers online.)

You don’t ‘hear’ DC - there is no audible noise, like static or white noise. Maybe you’ll hear the transform hum a little bit that’s a vibration that you’re hearing, caused by DC. Audiolab's new midrange product line is said to incorporate technologies from the new 9000 flagship models and consists of an integrated amplifier, a streamer as well as a CD transport.

Known for its amplifiers and digital source components spanning four decades, Cambridge-based Audiolab is now releasing its first product designed to improve the quality of AC electricity, the dual-action Audiolab DC Block.

The device is designed for use with a single audio or AV system component. Audiolab recommends that it should be used with the integrated amp or power amp component within your system to obtain the most significant benefit.

You often do not need super low noise regulators, you often do not need the lowest possible ESR caps. They are all design choices made by requirements, availability of parts and price. Will it audibly affect your particular speakers? I am not saying, so at all. But it’s easy to test.

The Audiolab DC Block 6 is designed to remove RFI/EMI whilst banishing ‘DC on the mains’, delivering rebalanced power for up to six separate components in an audio or AV system.

Wiring, PCB design often are far from optimal. But lets face it. Only very few people are really bothered by ground loops and they all can be solved by finding the loop(s) and breaking it/them. I/O's are not decoupled so in almost any ofthe designs I have scrutinized, interconnects shield noise is landed right on to the PCB instead of grounded to chassis. The stray infects the so delicate 0 volt ref voltage to numerous IC's including the DAC chip. Do not take just my word for it, it is a friend of mine, studio technician, Master of Science educated, at least 40 years in the profession, who rebuild DAC's like dCS, but also cheaper versions like Topping D90SE, who claims that ground ref is is a design flaw in it self as are many other areas. The ground is then also challanged by the standard procedure of soldering e.g. pin1 but also shields in USB's, I2S UI, etc in the PCB. The PCB ground should not be used to land noise from cable shield in my opinion. So when decoupling, you should be able to trust the ground you decouple to., but you cannot. One thing so often overlooked is the use of filter and buffert electrolythic caps. They are in the analogue domain often soldered i pairs from the positive and negative to the ground, instaed of caring for the ground by having one twice the size directly between positive and negative only. The filter caps for purely decoupling is wired equally. Why? Some brands use local regulators some do not. In my opinion all voltage regulators should of top class with a few microvolts ripple if any, and locally, with a large buffer, zobel and decoupling almost at the same pin as it is designed to feed. Hifi grade el caps is a myth. The modern 105 degree offers in general better life expectancy and radically lowered internal losses for decoupling. While studying various designs I stumbled across a TEAC DAC, that I personally found interesting as it took a grip of the dirty USB cable shield. It lands the USB port at separate pcb, hard coupled to chassis by a screw and just millimeters from the port, minimizing the lead reactans, the entire PCB is grounded to chassis. This is an example of a good design. Others in that DAC could be questioned in my opinion. Could not see, e.g. any signs of a grounded lead out from an electrostatic shield in the transformers. The science absolutely guarantees that removing DC improves a transformers ability to do its job, and therefore it is very likely to make an audible difference in audio equipment. I bet your speakers were designed on a clean mains supply, for sure.