Stillpoints Adhesive Backed ERS

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Stillpoints Adhesive Backed ERS

Winner of Positive Feedback Online's 2003 Brutus award


"...Immediately the sound was fresher, purer, and seemingly unencumbered by digital artifacts..."
  - Clark Johnsen, Positive Feedback (Article here)

Stillpoints ERS redirects, absorbs, and diffuses EMI/RFI frequencies. 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 analog circuits, the presence of EMI/RFI was tuned into the frequency response of the device. ers can effect of the amplitude of the high frequency and/or the low frequency extremes resulting in a less than desirable balance.

"...ERS has to rate right up there with the HAL-O tube dampers and the None-Felt turntable mat, as among the highest values in high-end audio..." - Rick Becker, (Article here)

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 10meg to 17 gig range. this is all that we can claim, due to it's defense restrictions.

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

ERS may all be purchased with a pressure sensitive adhesive already applied for easy and quick installation.

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.


Frequency Attenuation (dB)
10 Mhz 49
100 Mhz 48
200 Mhz 62
400 Mhz 53
800 Mhz 54
900 Mhz 50
1 Ghz 49
2.4 Ghz (802.11B, wireless networks, cordless phones) 53
3.5 Ghz 54
5.8 Ghz (802.11A) 57
7.5 Ghz 61
10 Ghz 66
17 Ghz 65

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. However, its effectiveness will be maximized when placed internally near either EMI/RFI generating or EMI/RFI susceptible circuitry within the enclosure. The enclosure itself, traps on board generated EMI and RFI which ERS absorbs, deflects and diffuses. ERS does not operate under the same principles as a shield thus it does not require grounding.

The amount of ers used is component dependent and must be experimented with. We have noticed that 100% coverage 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 theater 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. The 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 guidleines for using ERS.

  • Great results have been achieved by using the ERS tape to wrap power cords and interconnects. If you are odering 1" tape, generally you will need TWICE the length of whatever cord, interconnect, etc. you are trying to wrap. An alternative to wrapping is to lay the ERS length wise down the cord. This may take two, overlapping runs to completely cover the cable, but it is a time saver. ALWAYS do a "test wrap" before removing the adhesive backing!
  • 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.

3 Reviews Hide Reviews Show Reviews

  • 5
    ERS Paper

    Posted by Richard on 1st Sep 2021

    Amazing stuff! Several sheets employed throughout my audio and video systems. With today’s exposure to ever more RFI especially from upcoming and implemented 5G networks along with WiFi strength on both 2.4 and 5Ghz bands our electronics are hammered with pollutants. Tubes are especially vulnerable. These sheets are all essential to reduce or eliminate that exposure. I have been shocked at how much my systems have both been improved. I’m saddened that Stillpoints was forced to stop production. Get these while you still can! My suggestion is when used if possible and safe internally to use blue tack or similar products to adhere to the chassis interior unless it is not safe relative to shorting of internals. Since these are no longer produced if you have to replace or sell equipment if will not be possible to use in replacement gear.

  • 5
    ERS Cloth Tape

    Posted by PaperPro on 27th Feb 2021

    My Marantz CD 6006 had a flat darker sound to it. I had read about ERS Cloth and thought it might help. Heck in audio terms the cost is peanuts compared to other gizmos. It arrived quickly and in good form. I placed on the under side of the 6006 cover over the digital board and power supply area. The improvements were immediate! Much better clarity, bass is better defined, soundstage improved, inner details improved, and the background was mick darker and quieter. Every system is different but in my set up ERS Cloth ROCKS!

  • 5
    Stillpoints ERS works

    Posted by on 2nd Dec 2018

    I have to say that I do not have command of "audiophile speak". I placed strips of the 2x44" adhesive-backed ERS on the panel mounting hinges of my Sound Lab speakers and on two of the structural supports of the speakers. These hinges are plastic! Photos would make the locations clearer. I also placed 4x17" strips between a pair of steel ballasts that are resting on the electronic modules for these speakers. In every instance, the result was cleaner, more detailed representation of background instrumentals. It's not clear to me if there's a point beyond which more ERS would begin to dampen or suppress.