Mains Cables R Us has been building mains filters for many years; and we can supply them from as little as £40 for a basic single-component filter, up to £2000 for a full-system filtering solution.

CAD Ethernet Control

£1,295.00
The CAD Ethernet Control is designed to reduce unwanted high frequency noise on the Ethernet Network connection in audio and video equipment and will work with both streaming services (Spotify, TIDAL, Qobuz, etc.) and locally stored music files.

CAD USB Control

£695.00
The new CAD USB Control design resulted from our research and development of the CAD Ground Controls, 1543 MKII DAC and the many USB cables we have produced over the last 10 years. In our experience, reducing unwanted high frequency noise in audio systems significantly improves sound quality. The frequency of noise varies in every audio system and in each domestic environment – even the time of day on mains power. The USB Control reduces this unwanted high frequency noise across an extremely broad frequency spectrum, from KHz up into the GHz range. HiFi + Review

Connected Fidelity – RF Blocker

Price range: £235.00 through £249.00
A wide-band radio frequency filter that increases audio fidelity. The connected-fidelity™ “RF Blocker” is a simple to fit radio frequency (RF) filter array. It is supplied in pairs and there are three connection options – banana and spade terminals, or bare wires. They simply fit across the loudspeaker + and - input terminals (or amplifier loudspeaker outputs).
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FURUTECH FLOW-15 PLUS IN-LINE MAINS FILTER

£285.00
The Furutech Flow-15 Plus Inline Power Filter effectively removes all of that high-frequency noise from the mains power before it reaches your components.

Furutech NCF Clear Line AC Optimiser

£290.00
It takes just a moment to hear the difference that Furutech’s NCF Clear Line can make to your audio or video system. Why just a moment? Furutech’s Nano Crystal² Formula, also known as NCF, has resulted in a number of truly innovative and effective products over the past few years. NCF features a special crystalline material that has two distinct properties—it generates negative ions that eliminate static, and it converts thermal energy into far infrared. When combined with nano-sized ceramic particles and carbon powder, these crystals become the ultimate electrical and mechanical damping material. Created by Furutech, NCF is found exclusively in Furutech products and nowhere else. Now, Furutech has introduced perhaps the simplest way to implement NCF technology into your home—NCF Clear Line. Mono and Stereo Full Review Here
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iFi Audio AC iPurifier – Mains Audio/Line Conditioner/Filter/Isolator/Purifier (Single Unit)

£99.00
When you listen to music there’s a lot of background noise going on, coming in from the mains. Some noise cannot be missed but there’s also some that is not immediately obvious until it has gone. It comes from your power supply and interference and feedback from the power supply of other devices. Put the AC iPurifier in your set-up and you’ll notice the difference instantly.

MCRU Clip On Ferrite Cable Filters

Price range: £1.80 through £2.40
  • Ferrite rings
  • Clip on design
  • 5,7,9.13 mm i.d
  • Price is for ONE piece
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MCRU Furutech Ultimate Grounding Cable – 1.2 Mtrs

£65.00
If you need a grounding cable to go from your grounding box to your equipment or from your turntable to your phono amp we have the answer! Made in our workshops in the heart of Yorkshire to exacting standards the MCRU Ultimate Grounding Cable is made from audiophile quality parts from Furutech of Japan, all cryo treated as standard using a patented process. Terminations are as follows and can be supplied same at both ends or mixed, for example zplug (banana) one end and spade the other end. 4mm spade connector 6/8mm spade connector z-plugs (these also fit in banana plug sockets) All connectors are made by Furutech and are gold plated. To prevent RFI pick up the cable is screened and shielded using carbon infused polyester braiding.
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MCRU Mains Filtration Plug MKII

£96.00
Suitable for use next to hi-fi and AV systems and we recommend using as many as practically possible due to the proliferation in RFI/EMI related issues in modern day hi-fi systems

MCRU Optimus Ground

£450.00
As audiophiles of all types have begun to notice, grounding your equipment with a separate purpose built device brings instant sonic improvements.
This new grounding box is now available from MCRU. This unit has 3 separate chambers to effectively ground your equipment in addition to any other grounding you may use. It is particularly effective with noisy equipment such as music servers, streamers and DAC's. Simply attach the end of the cable to a spare input on your equipment or a grounding post if available. Supplied with 3 grounding cables made from japanese quality cable terminated with either USB, RCA, Spade, Mini Spade, Banana Plug. Each cable is 1.5 metres long, longer cables can be supplied for additional charge.
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MCRU Optimus Grounding Box

£145.00
As audiophiles of all types have begun to notice, grounding your equipment with a separate purpose built device brings instant sonic improvements.
The MCRU grounding device simply plugs into a spare socket on your equipment or into the mains wall socket with our UK plug version.
The device is supplied with a variety of end terminations to suit your chosen equipment.
There is nothing we know of that will not benefit from a separate grounding box.
The device has been tested on a variety of equipment including streamers, DAC's, phono stages, amplifiers and music servers.
Select options This product has multiple variants. The options may be chosen on the product page