Etymotic ER4SR In-Ear Monitors

Premium listening experienceThe Etymotic ER4SR's are the highest-performing single driver in-ear monitors. The IEM shells are made of anodized aluminum, CNC machined with extremely tight tolerances. Using a single Balanced Armature (BA) driver allows for incredibly accurate IEM without the any complexity from crossovers, whilst keeping the aluminum body small and slim. The included high-quality user-replaceable cable is reinforced and twisted, this improves longevity and durability.

Etymotic IEMs are world renowned for their class-leading passive isolation, providing 35-42 dB attenuation (depending on eartips used and the depth of insertion). For comparison, most custom IEMs provide around 25-28dB attenuation and foam ear plugs attenuate up to 32 dB. The ER4SR's are a must-have for discerning sound engineers, audiophiles, and consumers looking for the most accurate in-ear monitors available.

What's Included? • Etymotic ER4SR In Ear Monitors
• Detachable 4 ft. cable with 3.5mm gold plated stereo plug
• Assortment of eartips
• Filter removal tool and replacement filters to protect the BA drivers from ear wax
• Shirt clip
• Zippered storage case
• Channel-Matching Compliance certificate

designed by expertsEtymotic’s target frequency response graph displays a “perceptibly flat” frequency response. Their goal is to have a flat frequency response curve when the music reaches your eardrums. To achieve that, the resonance inside the average ear canal needs to be accounted for, as IEMs bypass the outer ear structure. The result is the need for higher SPL in the 2-5k region (lower treble) for compensating said resonance, which is the reason for the “hump” in that region.

The target curve that Etymotic is using for tuning their IEMs changes slightly from the Harmon preference curve. It was developed in-house over 20 years ago, leveraging on Etymotic's human hearing expertise and acoustics research.

every element consideredWhen tuning in-ear monitors to accurately reproduce a recording of a live performance, the goal is for the sound to be identical to that of the original performance. To achieve this, the acoustic properties of the ear must be considered.

The acoustic resonance and horn effects of the ear change a flat audio signal entering the open ear into sound with a (2700 Hz) high-frequency boost, which is the same response heard at the eardrum in a typical ear. That is the reason for the “hump” in the frequency response, which assures the eardrums perceive a perfectly flat frequency response for all frequencies.