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ER20 - Etymotic / ACS ER-20 High Fidelity Earplugs


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  • Model: ACSER20
  • Shipping Weight: 0.06kg
  • 0 Units in Stock
  • Manufactured by: Etymotic Research Inc


These are made by Etymotic but packaged under the ACS Brand (formerly Elain). Conforms to EN352-2 / SNR 18.


Your hearing provides you with the ability to listen to a massive range of different sounds. Hearing is one of our most important senses and we all take it for granted until something goes wrong. Imagine if that ringing doesn't go away, or if you can't hear parts of music and speech that you know are there! Listening at high volumes can damage your hearing permanently, but wearing regular earplugs kills the music and isolates you from what's going on around you. (You'll know if you've tried them, which is, after all, why you don't want to wear them)

ACS ER20's are different. They'll protect your hearing without spoiling your enjoyment of music and, reduce the risk of serious hearing damage later on. They use a patented, revolutionary filter system that drops the volume but retains all the fidelity and keeps you in the mix. They are ideal for use in most situations where noise is dangerous.

In the workplace it's the law for employers to provide hearing protection. Outside of work, it's down to you!

The ACS ER20 hearing protector has been allowing musicians and music lovers the world over to enjoy live music without the risk of damage to their hearing. The ACS ER20 is filtered to allow you to enjoy the full dynamic range of your music at lower, safer volumes avoiding the muffling effect that you experience with foam earplugs.

Your audio gatekeeper

The ACS ER20 is fitted with a flanged rubber tip that creates an isolating seal in your ear canal to block out sound so that it can then control what gets in and what doesn't. The central chamber of the plug creates an accoustic channel that feeds the sound up to the filter at the base of the eartip where the ER filter shaves an average of 16dB off across all frequencies giving the effect of turning the volume down on the world around you with no muffling.

The graph in the images section shows the attenuation characteristics of the ACS ER20 against a standard foam earplug illustrating the additional fidelity acheived as the frequency increases.

ACS ER20 High Fidelity Earplugs were developed to provide low-cost, one-size-fits-most high fidelity earplugs that can be used in a variety of noisy environments.

The goal of the ACS ER20 design was the same as for Musicians Earplugs: to reduce noise but preserve sound quality; in effect, to turn down the noise but not muffle voices, environmental sounds or music.


ACS ER20 Importance of Hearing Protection

Hearing loss is a function of exposure time, the average sound level, and the peak level of very loud sounds. Exposure to excessive noise from industrial machinery, heavy construction equipment and vehicles, power tools, aircraft, gunfire, motorcycle and auto race tracks, dental drills, sporting events, fireworks, rock concerts, marching bands, and music from a player's own instrument or nearby
instruments can cause hearing loss depending on the intensity and duration of the noise. Some persons seem more susceptible to hearing loss from high-level sound than others.

Some workers obviously need high-attenuation earplugs. Shipbuilders, flight crew who stand behind jet aircraft on the flight deck, and army tank operators usually fall in this category. Such individuals can't get enough attenuation for proper protection even with plugs and earmuffs combined. But, many industrial workers can be adequately protected with as little as 10 dB of attenuation:
the majority of eight-hour equivalent noise exposures fall between 85 and 95 dB. Some of these workers receive earplugs that provide too much attenuation, and as a result they do not insert them deeply in their ears because they can not hear speech clearly enough. These persons risk hearing damage, but have compromised so they have auditory awareness of sounds around them.

The cochlea has two types of hair cells, inner and outer. The outer hair cells appear to provide the ear's sensitivity to hear quiet sounds.
Inner hair cells appear to provide all the information to the brain. It has been suggested that high-intensity noise causes extensive damage to the inner and outer hair cells; long-term lower-level noise causing the same audiometric loss may show predominately outer hair cell loss. What this implies is that the type of noise a person is exposed to may determine the severity of communication
problems h/she eventually demonstrates.

Tinnitus (ringing in the ears) and temporary hearing loss can occur from a single concert, sporting event or sudden loud noise like a firecracker. In rare cases, permanent hearing loss results from such auditory insults. Even if a temporary hearing loss recovers over a period of hours to days, there is a risk that repeated exposure to loud noise will result in permanent hearing loss.

It is important that hearing protection is carefully selected for each individual, based on the intensity level, duration, and type of noise exposure.


Ready-Fit Earplugs

Low cost


Replicates the ear's natural response

Sound quality is preserved

Speech is clear, not muffled

Reduces sound approximately 20 dB at all frequencies

System Includes

ACS ER20 High Fidelity Earplugs

Carrying Case



This product was added to our catalog on Thursday 01 January, 1970.

Manufacturer Info