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
#very pleased, have bought 2 sets before this and will continue to buy them.
ednun pourtahmasbi, Amazon
7 December 2014
Summary: This is now my 3rd pair of these earphones. The design has not changed for many years. I purchased my first set back in 2006. They died in 2010, on to the 2nd set, then, my 3rd were bought at the end of 2014.
When I first got these I thought they sounded terrible. There was a lot of buzzing and vibration ...
Dom "Domx", Amazon
19 November 2014
Summary: When I first got these I thought they sounded terrible. There was a lot of buzzing and vibration sounds. I used the default earbuds and these were bought to replace old ER earphones where the cable had broken, after careful use.
Summary: I have had a pair of these earphones for two years now, I got them on eBay at the beginning of 2007 for £70. The sound is very good, and you can hear the bass clearly compared to other earphones. The foam eartips are better as they have better noise isolation.
Amazing for the right environment - very good elsewhere
19 May 2012
Summary: I bought these just as a pair of everyday headphones for my phone, rather than some fancy In Ear Monitoring application. They sound fabulous, precise and detailed in ever way. Not too heavy on the bass though if that's what you're into.
Excellente, analytische Präzision - Kabel starr und wirkt empfindlich
TH "TobInMuc", Amazon
3 March 2015
Summary: Es handelt sich bei dem Modell hier um das aktuelle 4PT mit einer Nennimpedanz von nur 27 Ohm. Somit kann jedes Smartphone die In-Ear-Monitore treiben. Auch liegt nun ein Adapterkabel bei, um das angeblich noch präzisere Modell 4S, welches eine Nennimpedanz von 100 Ohm aufweist, simulieren.