Reviewed Nov 2009
Details: Legendary IEM from Etymotic Research, first released more than a decade ago MSRP: $299.99 / manufacturer’s page
Current Price: $223.45 from Amazon.com
Newer ER4SR with removable cable available for $249 from Amazon.com
Specs: Driver: BA | Imp: 100 Ω | Sens: 100 dB | Freq: 20-16k Hz | Cable: 5’ L-plug Nozzle Size: 3mm | Preferred tips: Shure Olives, Etymotic tri-flanges Wear Style: Over-the-ear or straight down
Accessories (5/5) – Large selection of silicone and foam tips, plastic storage case, carrying pouch, two sets of spare filters, filter removal tool, ¼” adapter, and shirt clip
Build Quality (4.5/5) – The tubular are made out of a thick, sturdy plastic. Stock cables are thick, strong, and – if necessary – replaceable
Isolation (4.5/5) – Very deep fit. Etymotic claims a maximum attenuation of 42db, and I believe them
Microphonics (3.5/5) – Can be microphonic when used without the included shirt clip. Hard to wear over-the-ear due to long stem and thick cables
Comfort (4/5) – Have to be inserted quite deeply for ideal seal. The thin housing makes this easier and Foam tips often work great
Sound (9.2/10) – There is just no way not to be blown away with the level of detail these things put out. Unlike the RE0, which let the detail sink in slowly, the Etymotics smack you in the face with it. As a result, they can be very unforgiving of poor source material, as a good studio headphone should be – these are not for collectors of low-bitrate mp3s. The highs are detailed and extended, replete with mind-boggling crispness and resolution. The mids are smooth, detailed, well-placed and very engaging. Tone is neutral and the overall balance is excellent.
The bass has great detail but tends to be a bit thin of note. The ER4S is not bassy by any means, but definitely satisfying for those in search of quality over quantity. Bass texture is superb. The presentation is typical Etymotic – excellent instrument separation, good layering and positioning, but not much in the way of 3D space.
Amping: Not required but will go a ways towards making them shine with portable equipment. Though an mp3 player can drive them to decent volume, it will not unlock their full potential. With a decent amp (such as a mini3), the ER4S really opens the tap on speed and detail.
Value (8.5/10) – Make no mistake – Etymotic’s flagship is still a top-tier IEM 15 years later. The fact that the ER-4S costs $300 to some of the other flagships’ $400+ is a testament to its high value, not low worth.
Pros: Some of the most detailed sound to be had, durable, replaceable cables, unbeatable isolation, 2-yr warranty
Cons: Deep insertion not for everyone, can be difficult to wear over the ear, microphonics can annoy without shirt clip, very analytical sound