Stillpoints ERS Sheet

Stillpoints ERS Sheet

ERS (EMI & RFI Suppression) Fabric redirects, absorbs, and diffuses EMI/RFI frequencies. Price is for one sheet (279x206mm).

The benefits of ERS for audio/video are best heard with digital circuits due to the RFI creating aspect of the circuitry itself. Benefits of ERS can also be heard with AC power lines, signal cables, loudspeakers, and electronics of all types. However, in some analogue circuits, the presence of EMI/RFI was tuned into the frequency response of the device. ERS can effect the amplitude of the high frequency and/or the low frequency extremes resulting in a less than desirable balance.

What's it made of?
The core of ERS is made of a blend of carbon fibers of various lengths and sizes. Using a proprietary method, these fibers are coated with metals, such as nickel. These fibers absorb, reflect and diffuse RFI/EMI. ERS has on average about 66 db noise reduction in it's 10 MHz to 17 GHz range (this is all that Stillpoints can claim, due to defense restrictions).

The exterior is laminated with a polyester textile on both sides to make the material easier to handle and use.

The edges of ERS do have exposed conductive fibers and should be handled and installed with care. The electrical resistance of ERS is .026 ohms per square yard.
The polyester fabric will insulate the core of ERS, to some degree, but can be easily penetrated with sharp edges. Caution should be exercised when used in close proximity to circuitry.
ERS is treated to accept many laminating resins such as epoxy and polyester resins.

Watch a video demonstration here
Observe the screen on the left.

Why is it necessary?
With the exception of high end cables, EMI/RFI shielding is rarely, if ever a consideration when designing audio components. Yet it is one of the biggest culprits when it comes to sonic background noise and "edginess" exhibited by some audio gear. Manufacturers want to control costs, and adequate EMI/RFI control is not high on the list of priorities.
With the availability of ERS, one is now able to address this problem in their own system in a cost effective manner. Also noteworthy is the fact that since ERS does not operate under the same principles as a shield, it does not require grounding.

Useful Applications

A simple demonstration of the potential effectiveness of ERS is to lay it near any digital circuitry, for example, on top or underneath or at the sides of a CD player or DAC or digital amplifier. Wrapping AC cables or placing ERS near any AC power strips will also quickly show its potential.

ERS sheets can also be applied to components internally, but we do not advise you do this because the edges of ERS have exposed conductive fibers. This procedure should only be carried out by a competent technician.

The amount of ERS used is component dependent and must be experimented with. We have noticed that 100% coverage is not necessary. Fine tuning may result in very little material required.

Listed below are just a few ways in which ERS paper has been used to control and absorb EMI/RFI.

In general, lining the inside of a component's top cover is a good place to start. If you don't want to open up your piece of equipment, then just lay the sheet on top.
CD/DVD players - attached to the underside of the top, and attached to the bottom. This covers the power supply, and the digital ICs. Digital is probably the most notorious EMI/RFI polluter in a system.
Preamp/ processors - attached in a similar manner as the CD/DVD player.
Home theatre processors - Treat similarly to the DVD/CD player.
Electrical outlets - Cut in the same shape as the wall plate and place over the outside of the wall plate. ERS is placed on the outside of the wall plate because it IS conductive.
Power conditioners - wrapped around power cords, and covering the top, bottom and sides of a power conditioner. A very effective tweak.
Power cords - Wrapping the cord with ERS tape. We have had excellent results doing this. 1" tape works well. Multiple layers work well too.
Power transformers - Keeps stray RFI and magnetic fields from interfering with the audio signal.
Crossovers - Covering the top bottom and sides, as well as wrapping the internal wires. This method needs to be "tuned" to each individual system. You will know when you've added too much ERS, when the highs start rolling off, or midrange detail starts disappearing. Be prepared to spend some time on this.
Interconnects - Wrapping the interconnect with ERS tape. This too will require some fine tuning. I use a 1/4" strip wrapped around the very end of the RCA connector's outer shell. You may also try spacing the ERS away from the cable via foam pipe insulation.
Loudspeaker cables - Fine tuning required here as well. Start at the end that connects to the loudspeaker. You may also try spacing the ERS away from the cable via foam pipe insulation.
Video Cables - Component, composite, coaxial, and S-VHS cables all benefit. Wrapping the entire cable provides the most benefit in this case

How much do I need?
Hitting the level of diminishing returns with ERS is difficult, and system dependent. Below are some minimum guidelines for using ERS.
• For lining the top cover of a component, a minimum of two sheets are generally needed.
• For an amplifier, be sure to cover the area above and below the power transformer at the minimum. It takes about 1 sheet to do so.


Read the TNT Audio review here

Read the Stereo Times review here

Price is for one sheet (279x206mm).

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