Excerpt: I'm an acoustics professional with a pro audio background, and after much research and comparative listening, the ER-4's are the clear winner on the IEM market. The frequency balance is as close to flat as I've found in an IEM and compares favorably to my reference headphones and loudspeakers...
Pros: Accurate, Flat Response, Good Bass, Good Value, Great Sound
Excerpt: I purchased the Etymotic Research ER-4PT because I was going on a plane trip and I wanted the maximum passive noise isolation and the clearest sound reproduction possible. These ER-4PT headphones did not disappoint.
Pros: Durable, Good Value, Great Sound, Lightweight, Optional Custom Ear Tips, Stylish
Excerpt: I lost my prized HF5's and decided to make the leap to the ER-4pt's. I am pleased with my choice. These have a more robust construction than the HR5s, which felt dainty in comparison. The sound is a little more accurate and immersive than the HR5's.
Summary: Fantastic clarity and well worth the price. I have £500 + in ear phones and these are still my goto. If you want to listen to music how it was recorded buy these. Fantastic sound and a really long lead.
Summary: Like many, I have owned a wide range of IEMs over the years ranging from £20 to £200+. Without question, the best pair for pure sound quality were my Etymotic HF3's thought I bought about 3 years ago.
The best and most naturally sounding Etymotics I ever had
Costas Hassiotis, Amazon
1 March 2015
Summary: The best and most naturally sounding Etymotics I ever had. Accurate,articulate bass and supreme mids.Very comfortable if inserted properly,excellent sound insulation and very well packaged.No frills,well above average made quality.Fully recommended!